Objectives To assess non-health literature, identify key strategies in promoting more networked teams and groups, apply external ideas to healthcare, and build a model based on these strategies.
Design A systematic review of the literature outside of healthcare.
Method Searches guided by Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) of ABI/INFORM Global, CINAHL, IBSS, MEDLINE and Psychinfo databases following a mind-mapping exercise generating key terms centred on the core construct of gaps across organisational social structures that uncovered 842 empirical articles of which 116 met the inclusion criteria. Data extraction and content analysis via data mining techniques were performed on these articles.
Results The research involved subjects in 40 countries, with 32 studies enrolling participants in multiple countries. There were 40 studies conducted wholly or partly in the USA, 46 wholly or partly in continental Europe, 29 wholly or partly in Asia and 12 wholly or partly in Russia or Russian federated countries. Methods employed included 30 mixed or triangulated social science study designs, 39 qualitative studies, 13 experimental studies and 34 questionnaire-based studies, where the latter was mostly to gather data for social network analyses. Four recurring factors underpin a model for promoting networked behaviours and fortifying cross-group cooperation: appreciating the characteristics and nature of gaps between groups; using the leverage of boundary-spanners to bridge two or more groups; applying various mechanisms to stimulate interactive relationships; and mobilising those who can exert positive external influences to promote connections while minimising the impact of those who exacerbate divides.
Conclusions The literature assessed is rich and varied. An evidence-oriented model and strategies for promoting more networked systems are now available for application to healthcare. While caution needs to be exercised in translating outside ideas and studies, drawing on non-health ideas is useful in providing insights into other sectors.
- Collaborative care
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Strengths and limitations of this study
This is a large systematic review of the non-health literature applying strategies originating outside of healthcare to counterbalance healthcare insularity and for learning to develop more connected, networked systems of care.
It creates a model for facilitating networks.
It provides strategies stakeholders can adopt to increase networked collaboration between and across teams and groups.
Findings need to be interpreted with caution, as always when applying ideas and evidence from other sectors to healthcare.
Healthcare has been criticised, implicitly or explicitly, for being inward-looking.1–3 There are exceptions to this general rule. Attempting to apply aviation knowledge to medicine,4–6 generic quality-improvement methods to health systems7 ,8 and basic science techniques to medical research9 are cases in point. A failure to resort to ideas, theories or evidence from outside the sector can lead to claims of tunnel vision, blinkeredness or insularity. Those who have difficulty exploiting external solutions may be unduly resistant, merely uninformed or using defensive routines10 ,11 aimed to protect the status quo or to save face in the light of external evidence that could otherwise alter their practice or worldview.12 Recent work argues for the importance of going outside healthcare to understand the mechanics of its networking.13 Relatively new ideas have been imported from or influenced by other sectors, including interprofessionalism14 ,15 and its close cousin multidisciplinarity,16 ,17 systems thinking,12 ,18 ‘small world’ networks,19 culture-change models20 and teamwork21 ,22 (eg, through virtual teams23–25).
There are many examples from sociology or systems theory which can be drawn on to understand networking, or more broadly, to promote collaborative concepts. Table 1 provides definitional guidance for the key terms used. Of particular interest, Weick's original idea of tight and loose coupling,26 ,27 for instance, raises attention to the relative flexibility or rigidity of organisational structures. To understand coupling, Weick hypothesised that events, departments, groups and other organisational entities can be tightly bound or more loosely connected depending on the cultural characteristics of the organisation, the technical rules imposed on people and the extent to which those in authority attempted to induce tightness or looseness. In tightly coupled organisations, the tendency is to be rules-governed, prescriptive and to operationalise control mechanisms. In loosely coupled organisations, people have more scope to exercise discretion and may be relatively autonomous decisionmakers.
Taking a different but related track, early network theorist Granovetter28 examined the ties between people in networks. In social network theory, people are depicted as nodes and the connections between them as lines between the nodes. People can be connected directly (one degree of separation between them) or less directly (two or more degrees of separation between them). Those with strong ties between them are those who are typically connected closely, who know each other within a group, or who have first order relationships. They directly know, relate to and deal with each other. Weakly tied people are less directly connected. They are acquaintances, those on ‘nodding’ terms, and friends-of-friends—those who can be sought out for help or information beyond people's immediate social circles.
The problem and attempts to induce more networked behaviours to date
What is common among the competing theoretical paradigms, such as Weick's and Granovetter's hypotheses, is the degrees of connectivity or extent of fragmentation between networking or potentially networking groups. Effective communication and relations across organisational teams and groups are by no means universal. In healthcare, the professional divides,29 ,30 entrenched subcultures,31 ,32 organisational silos,33 ,34 isolated cliques, uncommunicative teams, poorly relating groups, and disconnected wards, units and departments35 ,36 are often the norm. Unfortunately, examples of effectively networked or collaborative care in health settings, such as Wagner's chronic care model,37 ,38 the patient-centred medical home39 ,40 and local initiatives, such as the collaborative care model for Alzheimer disease,41 are relatively isolated instances, but exemplify how more joined-up behaviours can be encouraged.
The popular response in health settings to address this type of problem, involving attempts to induce greater levels of networking, has been to study, promote or induce teams or microsystems,42 fortify within-group cooperation,43 nurture better internal relationships44 or promote productive, trusting interactions.45 There have also been attempts in some health sectors to encourage clinical networks across delivery systems.46–49 However, progress has been slow. There remain many striking examples of fragmented healthcare organisations and systems,50–52 poorly performing services53 or dysfunctional cultures.54 ,55 Few, if any, healthcare policymakers, managers, clinicians or researchers have failed to experience these. Fragmentation is also evident in sectors outside healthcare, but there are also studies of interconnected systems and studies of networking from these sectors. These can inform the thinking of healthcare insiders, and are the focus of this paper.
To apply learning from other sectors to healthcare, the paper takes a specific focal point. Intensifying efforts to create better internal teamwork does not logically improve cross-team behaviours. Building connected systems of care is likely to need greater understanding of behaviour at the edges of, and gaps between, teams and groups, rather than how well they work internally. The legendary quality improvement thinker W Edwards Deming's ninth point in his 14 key principles for organisational transformation in Out of the crisis7 is the exhortation to “break down barriers between departments”. The aim, therefore, is to figure out how to join groups together collaboratively across pre-existing divides and barriers. There are sporadic examples of how to do this in healthcare.13 ,35 ,56 ,57 However, this is a wicked problem, and more work is needed.
A recent review of between-group behaviour in healthcare identified 13 studies,35 concluding that fragmented systems and services are prevalent, and that individuals with roles that promote interaction across teams and groups, such as clinical opinion leaders or those with high levels of sociability, represent potential forces in forging greater levels of connectivity. In order to document a wider range of ideas and possibilities, this review builds on that work and the research it synthesised by examining non-health literature on gaps, disconnections, weak ties, social spaces and structural holes between teams and groups on the one hand, and the edges and boundaries of these on the other. The aim is to identify and apply lessons on cross-group activities from outside the health sector. Following this, a model will be developed to provide insights into how to promote more joined-up, networked care.
Systematic review procedures adopted conform to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines58 and have been documented elsewhere.13 ,59 A comprehensive literature review aiming to assess papers published until June 2012 was conducted by interrogating the ABI/INFORM Global, CINAHL, IBSS, MEDLINE and Psychinfo electronic literature databases since their inception, closely following a published guide to systematic reviews in healthcare.59 By utilising brainstorming techniques, a mind-mapping exercise, previous research,13 and a preliminary review of the literature, the following search terms were generated: ‘social boundar*’, ‘group boundar*’, ‘network boundar*’, ‘social network boundar*’, ‘social group boundar*’, ‘liminal boundar*’, ‘social edge*’, ‘group edge*’, ‘network edge*’, ‘social network edge*’, ‘social group edge*’, ‘liminal edge*’, ‘social space*’, ‘group space*’, ‘network space*’, ‘social network space*’, ‘social hole*’ and ‘structural hole*’. Selection criteria restricted the target references, depending on database, to ‘human’, ‘English language’ and ‘scholarly journals’.13
Citations, abstracts and complete references that where available were downloaded into Endnote X5, a bibliographic software management package. Of the 9025 references found in the search, 7908 remained after duplicates were removed and these were narrowed further to 842 research articles by excluding non-empirical work. All empirical research designs were included to provide an overview of the types of studies being conducted. The sample of references was further refined by subjecting these to scrutiny by three independent researchers. The articles had to fulfil three criteria: including work specifically related to cross-social groupings and clusters (eg, teams, groups and networks) in social spaces (eg, structural holes, weak ties and gaps), at the borders (eg, edges, boundaries) and in specific places (eg, in industries, organisations, communities, schools and churches). All papers were assessed against the inclusion criteria by two reviewers (JT and DD initially, and in a second round, by JB and DM, see acknowledgements), who assessed study quality and met to reconcile any disagreements, discussing these until consensus was reached.
The remaining references which met the inclusion criteria (n=219) were then further restricted to 2005-June 2012, emphasising relative recency. Apart from some older papers that were considered key to the topic area, two papers were added via snowballing (n=129), and the sample separated into health (n=13) and non-health (n=116) subsets. The review of the health literature was published35; the systematically-oriented review of the non-health literature is the subject of this paper.
A Leximancer content analysis60 applying data mining techniques to the 116 research papers yielded key concepts (table 2) and themes (figure 1), identifying the number of times each concept was used, indicating how widespread it prevailed in the literature and its relevance to the overall sample. Concepts in the Leximancer terminology (see table 2) are clusters of words that relate together, similar to those that would be found in a thesaurus. Themes are groups of concepts sharing commonalities or connectedness. Thus, concepts are more fine grained and themes are more broad language clusters. In the Leximancer thematic map of the literature (figure 1), each circle is a theme and each dot a concept, with the connecting lines illustrating how related they are.
The central concepts and themes show that the literature repeatedly discusses networks, social, capital and knowledge in social context, emphasising collaboration and cooperation. It is centrally about communication, work and activities, and their management in groups or organisations.
The 116 studies were systematically reviewed. Full papers were assessed by two independent researchers (JB and DM, see acknowledgements) and a random sample checked by a third (CW, see acknowledgements) and the key features abstracted (see online supplementary table S1). Common themes were identified using grounded theory, following the procedure outlined by Glaser and Strauss.61 The researcher and supporting reviewer (JB and DM, see acknowledgements) assessed the papers until these themes emerged as the most commonly occurring premises.
The research involved subjects in 40 countries, with 32 studies enrolling participants in multiple countries. This literature includes 40 studies conducted wholly or partly in the USA, 46 wholly or partly in continental Europe, 29 wholly or partly in Asia and 12 wholly or partly in Russia or Russian federated countries. Methods employed included 30 mixed or triangulated social science study designs, 39 qualitative studies using various social science methods (interviews, ethnography, focus groups), 13 experimental studies (in psychology laboratories, for the most part) and 34 questionnaire-based studies, the last category mostly to gather data for social network analyses. Many studies were theoretically informed, particularly concerning group and team theories, and many drew on constructs from social network theory.
Overall, this research synthesised wide-ranging studies centred on the core constructs of networks, gaps and fragmentation across gaps in organisational settings. What does it indicate to those hoping to induce more productive networked structures, and apply that knowledge to healthcare?
The literature in perspective
Understanding how teams and groups interact across their boundaries, through formal and informal members operating at the edges and relating to each other to a greater or lesser extent collaboratively or competitively, is a crucial phenomenon to understand. Organisational gaps and boundaries underpin the mechanisms by which behaviours, practices, attitudes and values spread; how innovation diffuses and cultural characteristics permeate into systems; and how ideas, knowledge and messages translate and migrate across systems and subsystems.62–65 Barriers and obstacles to creating joined-up teams and groups are omnipresent.31 ,32 ,34 ,56 In one study, obstacles manifested as three types—psychological, situational and social—and women perceived more barriers to networking across teams and groups than did men.66 ,67
Taken together the results show that, as a general rule, teams and groups tend to promote an inwardly-focused identity. Strong in-group norms and behaviours operate within teams and groups. People not only identify with the group to which they belong, but their psychological well-being is often bolstered by their membership, particularly if their group is perceived to be prestigious or beneficial to them.68 Members will collectively draw mental or physical boundaries around themselves, circumscribing their group. People also perennially favour their group: the manifestation of in-group bias is strong and seemingly ubiquitous.69 Professions and organisational units, for example, almost always support and favour internal members over their counterparts in external professions or units. Indeed, who is in or eligible for membership, and who is not is in large part what defines a team or group. The phenomenon does not stop there. Teams and groups seem to be characterised by tacit or explicit knowledge about their membership or who is eligible for membership, and can readily identify those who are not members.69 This poses considerable problems for those seeking to encourage networked behaviours and collaborative structures.
People then align themselves, and identify closely with their own team or group.70 Teams and groups often demand or uphold loyalty from members. Deviants or those who are antigroup or antisocial can be subject to various forms of punishment71 such as being frowned on, gossiped about, left out, shunned or treated as being disloyal. These, among other determinants signifying identity, can lead to strong ‘us and them’ perspectives vis à vis other groups. Outgroups are often treated indifferently, unsympathetically or suspiciously.68 ,72 ,73 There can be prejudice, enmity or even hostility between groups.69 ,74 All told, this state-of-affairs calls for active strategies to promote collaboratively-oriented systems. However, can disparate teams and groups actually be joined-up by active agency into more expansive networks?
A four-factor framework for collaboration across teams and groups
From the literature assessment and content analysis, a framework synthesising and integrating the current state of knowledge was derived. Figure 2 provides four core factors for appreciating networked efforts: understanding the nature of gaps, using the leverage of boundary spanners, stimulating interactive relationships and exerting power via external influences. These were frequently occurring common factors embedded implicitly or accounted for explicitly in the included literature. Within each factor, various strategies with utility for sponsoring networked collaboration across teams and groups are evident.
The figure depicts two social entities interfacing each other across an organisational divide. These could be, for example, two wards or two organisational units; or a group of doctors interfacing with another group of doctors; or a group of nurses or allied health professionals, working adjacent to each other. They are bounded, and will have greater or lesser levels of communication, connectivity or interactivity between themselves across the social space delineating them as separate groupings. The question is how to bridge the gap and thereby, help to promote networked connectivity. With that in mind, we turn to a brief description of the four factors and how these operate according to the synthesised studies in the non-health literature. This provides us with lessons about networking and how it operates elsewhere.
The nature of gaps (social or physical spaces, structural holes, disconnected ties) between teams and groups can be characterised and this information used to help join-up those who are unduly divided. Gaps can clearly act as barriers to knowledge and information exchange.63 ,75–77 However, gaps can also be useful: structural holes in networks,78 ,79 for example, offer opportunities for bridging behaviours. Once these gaps are recognised, people can begin to act to close gaps between teams and groups. All in all, a moderate level of spacing between teams and groups in complex social systems seems optimal in promoting interaction.80 ,81 Too many gaps or too wide the spacings between groups can indicate disunity or disintegration, which makes it hard to enhance linkages. Too few gaps, and narrowness increases the risk of poorly formed localised identities or the system being overconstrained, with no breathing space between the team or group. Building effective relationships across gaps or structural holes looms78 ,79 ,82 as an important activity in joining-up teams and groups. Collaboration and partnerships can be encouraged by understanding the nature of the outgroup and intergroup behaviours,68 and the unwritten rules between groups such as those that inform each potential partners’ views on their own and the others’ strengths, limitations and capabilities.83 ,84 Wenger's work on communities of practice85 ,86 and its application87 ,88 is a case in point.
Boundary spanners depending on the circumstances can bridge two or more groupings, and enable exchange and communication. Such roles are often highly regarded and those occupying them can make a valuable contribution in promoting connections between people and groups.89 Useful initiatives to promote boundary crossing include: identifying those with facilitation skills,90 or encouraging potential bridge-builders (those who span or straddle otherwise isolated teams and groups), connectors (people actively linking two or more teams and groups), liaisons (people who shuttle between teams and groups, enabling relations and communication), mavens (folks with a wide circle of contacts), opinion leaders (influential individuals to whom others turn to for advice or information) or cosmopolites (persons with wide-ranging interests and interactions). However, boundary spanners, in the process of fulfilling their role by bridging gaps inevitably alter relationships, and by their efforts to join-up two previously divided groups can create different boundaries and gaps elsewhere. Interestingly, liberal-leaning rather than conservative-leaning individuals are more likely to bridge gaps or boundary span, and advance collaborative activities.91 Gatekeepers play an important protective role in healthcare. For example, in some countries, general practitioners prevent patients from unnecessarily entering specialised healthcare and being over-serviced. However gatekeepers,92 blockers and manipulators can inhibit boundary-spanning behaviours. They need to be identified and their negative influences negated or minimised if networked, collaborative behaviours are to be realised.
This leads to the challenge of how to stimulate interactive relationships. Recurring ideas in the literature include: building joint social capital by emphasising mutual goodwill across teams and groups;74 ,93 formally linking otherwise disparate groupings together;92 providing informal opportunities to inter-relate,77 ,94 including creating commonly-available public space in which to intermingle;25 ,95 promoting dialogue and shared meaning between groups;96 agreeing on joint agendas;97 striving for inclusivity;98 ,99 supporting social diversity100 and generally encouraging, over time, connections and exchanges between teams and groups. These strategies can, depending on the circumstances, strengthen communication and information exchange. Leaders who support informal social activities and promote social ties, for example, after-work activities, can improve productivity and particularly, intergroup functioning and performance.101 People who have strong relationships across teams and groups, and are embedded in the larger organisational culture are less likely to signal an intention to leave their organisation,102 and this can be important in building long-term connectivity. Trust is an important commodity in linking teams and groups;103–105 so building up of trust is an important endeavour. Taken together, these strategies can help connect teams and groups. The right strategy-mix will need to be determined by formal and informal leaders and members of the teams and groups themselves, and are often defined by the context.
External influences can also play a bridging or dividing role. A tertius iungens agent (‘the third who joins’) who builds bridges can help facilitate group interaction, but a tertius gaudens agent (‘the third who enjoys’) can exacerbate existing divides, exploiting these for his or her own benefit.78 ,79 ,106 While there is some support for the notion that outsiders cannot readily dictate to teams and groups,67 other work suggests that group members who share a common enemy107 ,108 or jointly emphasise their distance from or aversion to other groups, thereby differentiating themselves,109 will be more likely to collaborate with each other. This has been a long held belief: if, as the old Arab proverb states, “the enemy of my enemy is my friend” then it is also likely to be the case that “my friend's enemy is my enemy”. Whether or not this is so, teams or groups sharing a negative attitude about or a perceived threat from a third party will be likely to move closer to each other.107
Some key theoretical perspectives
Various theoretical perspectives can be mobilised to explain these empirical findings and the four-factor model. We have specifically encountered two: Weick's tight-loose coupling helps us to understand the extent to which characteristics, such as rules or discretion, are at work in having greater or lesser effects on connectivity between teams and groups. Granovetter's strong and weak ties asks whether people adjoining each other are in a direct relationship, or more distant from each other, that is, merely acquaintances. Either theory can help to some extent illuminate networked patterns of behaviour, and suggest mechanisms to strengthen interactions.
Two other theoretical accounts stand out in further explaining the model. The phenomenon of ‘us and them’ is a subset of social identity theory,108 ,110–112 which suggests that humans have strong self-concepts tied to needs for belongingness with those in their in-group, and seek to identify with, be part of or embrace the attitudes and behaviours of their fellow group members. Consequences foreshadowed by social identity theory include robust bias in favour of the in-group, and preferential treatment for fellow members. In-group members are often seen to be estranged from, prejudiced about, competing with, scapegoating or even hating those in out-groups. Clearly, there can be strong pressures or motivations to affiliate with one's group and to distrust, treat warily or actively dislike other groups. Antidotes, such as those described in the conceptual framework for networking (figure 2), will likely need concerted, longitudinal effort to tackle ‘us and them’ feelings and behaviours. Even then, gains are not likely to be huge.
Another mechanism underpinning networking is described by reciprocity theory, also known as tit-for-tat,113 ,114 which predicts that teams and groups will retaliate equivalently. Tit-for-tat theory suggests that the way group members treat those in other groupings, whether badly or well, is more than likely to be reciprocated. This is exemplified by many game theory studies100 and much of the literature from the earliest time period, for example, “do unto others as you would have them do unto you” and “an eye for an eye and a tooth for a tooth”. Successive iterations of reciprocity can readily hard-wire into collaboration or hostility. This phenomenon is strongly related to trust.77 ,115 An optimal response pattern for collaboration across teams and groups seems to be: always start relationships cooperatively, do not be the first to defect, and practise forgiveness when wronged.114
Of course, there are other theoretical accounts which could be developed to help understand groups’ relationships. These include explaining how some teams or groups come to be especially good at connecting with nearby teams or groups compared with others who are not; the mechanisms of affiliation across teams and groups when it spontaneously occurs; specifying how one group comes to be dominant and another subservient; and concepts of mutuality versus rivalry, manifesting most frequently as cooperation versus competition. Each of these is likely to be fruitful to a greater or lesser extent in contextualising the relationships between teams and groups, and could be useful gateways to further research.
The nature of gaps and boundaries, and applications in healthcare
The core ideas of gaps, boundary spanners, interactive relationships and external influences found in the literature review are very well suited to the analysis of healthcare. There are concrete implications for healthcare settings.
Gaps interfering with joined-up services, a key feature of health systems, are very hard to bridge. Gaps can be the physical area between one department and another, the silos operating to structurally delineate medicine, nursing and allied health staff or the temporal divides that separate two or more groups working shifts. These can also emerge as the conceptual gulf between the attitudes of people in one part of the healthcare organisation or system and another. Gaps often manifest as the cultural differences demarcating one unit or professional group (‘us’) and the other (‘them’). All organisations create barriers and partitions which inhibit or prohibit collaboration because of specialisation, myopic internal focus or tribalism. Problems arise where this interferes with effective organisational functioning or the delivery of good care.
Boundaries are phenomena of interest if we have to learn to bridge gaps and create better networked systems of care. Boundaries can be sharp and obvious, as between hospitals and nursing homes or amorphous and unclear, as when two or more organisational groupings remain as separate entities, but share resources, leaders, staff or physical space (eg, different specialists; physicians and nurses; or day and night shift staff). In healthcare there are formal organisational gaps, that is, ‘you are department A and we are department E’, and physical or location gaps, that is, ‘we work here and you, behind that partition, across the corridor, on another floor, or in another building, are over there’. There are conceptual gaps, manifesting in differentiable mental models, that is, ‘you think that way, but we don't’. And there are behavioural gaps, as in ‘this is how we dress, speak, and practise, compared with you’. Gaps can be emotional, for example, two teams who have come to detest each other and are poles apart, or conceptually different, as in the gap between achieving a ‘personal best’ in a team developing a new model of care and a rival teams’ normal, everyday performance. However, categorised gaps and boundaries distinguish teams and groups, and define where one ends and another begins. For those seeking to influence the health system to thereby create networked care, these gaps and boundaries should not be ignored. Instead, by identifying the nature of gaps and boundaries, we can begin to focus on the efforts that are needed to join them up, and create more synergistic effort to improve care for the benefit of patients. This is perhaps the major lesson to take home from this review.
Systematic reviews including this one are limited by the constraints of the inclusion criteria, in this case the terms and the date of the review period (2005–June, 2012). Applying ideas from other settings to healthcare may pose challenges.
This systematically-oriented review provides an assessment of a large volume of non-health literature, presenting a four-factor model and strategies for translating insights and ideas to the health sector. It sought to facilitate access to external thinking as an antidote to health sector insularity, and as a way of understanding how to build more connected, networked systems of care. While caution is warranted in translating unmediated ideas and evidence from other sectors to healthcare, drawing on outside ideas to tackle hard problems is useful in at least providing insights and seem to be overdue.
These findings may be of benefit to healthcare stakeholders seeking greater levels of networked collaboration. However, no one should doubt the immense challenges facing those seeking to build more productive networking across healthcare delivery systems.
The original literature searching and reviews, and the Leximancer analyses were conducted in conjunction with my brilliant colleagues Dr Joanne Travaglia (JT) and Dr Deborah Debono (DD). Ms Danielle Marks (DM) provided invaluable research assistance, as did Mr Chris Wu (CW), and Dr Brette Blakely reviewed an earlier manuscript for readability. They have my sincere appreciation.
Review history and Supplementary material
This web only file has been produced by the BMJ Publishing Group from an electronic file supplied by the author(s) and has not been edited for content.
- Data supplement 1 - Online table
Funding This research was supported under Australian Research Council's Linkage and Discovery Projects funding schemes (project numbers LP0 775 514 and DP0986493), and National Health and Medical Research Council's programme grants in patient safety (programme APP568618 and APP1054146). No funding bodies had any role in the design, data collection and analysis, decision to publish or preparation of the manuscript.
Competing interests The author has completed the ICMJE uniform disclosure form at http://www.icmje.org/coi_disclosure.pdf and declares: the author had financial support from grants from Australian Departments of Health; the National Health and Medical Research Council; and from the Department of Industry and Science-Australian Research Council, during the conduct of the study.
Ethics approval Ethics approval for our research is held at University of New South Wales, and Macquarie University, Australia.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement No additional data are available.
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