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Menstrual hygiene management among adolescent girls in India: a systematic review and meta-analysis
  1. Anna Maria van Eijk1,
  2. M Sivakami2,
  3. Mamita Bora Thakkar3,
  4. Ashley Bauman1,
  5. Kayla F Laserson4,
  6. Susanne Coates3,
  7. Penelope A Phillips-Howard1
  1. 1Department of Clinical Sciences, Liverpool school of Tropical Medicine, Liverpool, UK
  2. 2Tata Institute of Social Sciences, School of Health Systems Studies, Mumbai, Maharashtra, India
  3. 3UNICEF India, New Delhi, India
  4. 4Centers for Disease Control and Prevention (CDC) India, Atlanta, Georgia, USA
  1. Correspondence to Anna Maria van Eijk; amvaneijk{at}gmail.com

Abstract

Objectives To assess the status of menstrual hygiene management (MHM) among adolescent girls in India to determine unmet needs.

Design Systematic review and meta-analysis. We searched PubMed, The Global Health Database, Google Scholar and references for studies published from 2000 to September 2015 on girls’ MHM.

Setting India.

Participants Adolescent girls.

Outcome measures Information on menarche awareness, type of absorbent used, disposal, hygiene, restrictions and school absenteeism was extracted from eligible materials; a quality score was applied. Meta-analysis was used to estimate pooled prevalence (PP), and meta-regression to examine the effect of setting, region and time.

Results Data from 138 studies involving 193 subpopulations and 97 070 girls were extracted. In 88 studies, half of the girls reported being informed prior to menarche (PP 48%, 95% CI 43% to 53%, I2 98.6%). Commercial pad use was more common among urban (PP 67%, 57% to 76%, I2 99.3%, n=38) than rural girls (PP 32%, 25% to 38%, I2 98.6%, n=56, p<0.0001), with use increasing over time (p<0.0001). Inappropriate disposal was common (PP 23%, 16% to 31%, I2 99.0%, n=34). Menstruating girls experienced many restrictions, especially for religious activities (PP 0.77, 0.71 to 0.83, I2 99.1%, n=67). A quarter (PP 24%, 19% to 30%, I2 98.5%, n=64) reported missing school during periods. A lower prevalence of absenteeism was associated with higher commercial pad use in univariate (p=0.023) but not in multivariate analysis when adjusted for region (p=0.232, n=53). Approximately a third of girls changed their absorbents in school facilities (PP 37%, 29% to 46%, I2 97.8%, n=17). Half of the girls’ homes had a toilet (PP 51%, 36% to 67%, I2 99.4%, n=21). The quality of studies imposed limitations on analyses and the interpretation of results (mean score 3 on a scale of 0–7).

Conclusions Strengthening of MHM programmes in India is needed. Education on awareness, access to hygienic absorbents and disposal of MHM items need to be addressed.

Trial registration number CRD42015019197.

  • PREVENTIVE MEDICINE
  • PUBLIC HEALTH

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Strengths and limitations of this study

  • This study combines current knowledge on menstrual hygiene management (MHM) among adolescents in India.

  • The review provides a wide perspective, evaluating multiple outcomes, such as awareness of menarche, source of knowledge on MHM, MHM absorbents used, restrictions during menstruation, and school absenteeism.

  • The quality of studies and lack of information on school sanitation imposed limitations on the type of analyses that could be conducted and on the interpretation of results.

  • Despite the caveats, our data suggest that such studies can provide data relevant for the development of MHM packages which support girls' menstrual needs.

Introduction

Menstrual hygiene management (MHM) is a problem for adolescent girls in low and middle income countries (LMICs), particularly when attending school.1 Poor water, sanitation and hygiene (WASH) facilities in schools, inadequate puberty education and lack of hygienic MHM items (absorbents) cause girls to experience menstruation as shameful and uncomfortable (figure 1).2–5 Qualitative studies report girls’ fear and humiliation from leaking of blood and body odour, and lead menstruating girls to absent themselves from school,2 ,6 ,7 with little quantitative data confirming this.7 ,8 Cultural taboos add to girls’ difficulties, preventing them from seeking help,9 ,10 and impose restrictions on their diet and activities when menstruating.9–12 Insufficient MHM may result in health symptoms involving the urinary and genital tracts.13–15 Recent international concern for MHM, spearheaded through work to improve WASH in schools, has focused on the need for dignity and privacy, on raising awareness to break the silence and stigma, making safe and effective MHM absorbents accessible, and improving the school WASH environment. The latter includes separate toilets for girls, water and cleansing materials, and safe disposal of soiled materials.16–19

Figure 1

Elements important for menstrual hygiene management.

India is a country of contrasts, with extreme wealth and poverty and gender-related disparities, resulting in significant variation in health and social indicators among girls and women.19 Of the 113 million adolescent girls, 68 million attend about 1.4 million schools, with poor MHM practices and cultural taboos considered to be impediments to their school attendance.4 ,11 ,20 Recognising the relevance of MHM to the health, well-being and educational achievements of girls, the Government of India has initiated an array of policies and programmes, implemented at state level.20 Numerous MHM studies have been independently conducted across India, examining the prevalence of social, educational and health problems faced by girls with poor MHM. This systematic review and meta-analysis examined all papers published between 2000 and September 2015, to assess the status of MHM among adolescent girls in India to determine unmet and priority needs, and to develop a package of interventions for schoolgirls. The findings can also assist policymakers globally in the development of MHM policies for adolescent girls.

Methods

Search strategy and selection criteria

Methods of analysis and inclusion criteria were specified in advance and documented in the registered Prospero protocol (CRD42015019197). We searched for observational studies with information on MHM (knowledge, attitude, perceptions and practice) among adolescent (10–19 years) girls in India published between 2000 and September 2015. No language or publication status restrictions were imposed a priori. Studies with mixed age populations were included if adolescent girls were part of the age range, as were studies with mixed designs and studies where MHM was not the main topic. Baseline surveys were extracted from studies with a before-after design. We used PubMed, the Global Health database and Google Scholar using the keywords ‘adolescent OR adolescence OR puberty OR peer OR school’ AND ‘Menstruation OR menstrual OR menses’ AND ‘hygiene OR hygienically OR sanitation OR sanitary’ AND ‘India’ (see online supplement S1). We searched the ‘grey literature’ (eg, reports from UNICEF about school sanitation retrieved in Google Scholar), conference abstracts and manually reviewed reference lists of eligible publications. The last search was conducted on 19 September 2015. The following outcomes were examined: awareness of menarche before the start of menstruation, and sources of the awareness; knowledge of source of bleeding, perception of menstruation as a normal phenomenon, information sources for menstruation, type of absorbent used, disposal of absorbents, daily bathing, restrictions imposed, school absenteeism during menstruation, change of absorbent in school and availability of toilets at home. We use ‘absorbent’ to refer to any product used to collect menstrual flow; commercial pads refer to those marketed and available for purchase in shops.

Study selection, data extraction

One reviewer (AMvE) screened abstracts or full texts of all citations obtained for eligibility. Data extraction of eligible material and the quality assessment was conducted independently by two reviewers (AMvE and MS or AB) using a data extraction framework (see online supplement S1) and standardised pretested extraction forms. We extracted data on study characteristics (site, year of study, participants, inclusion criteria and sample size) and outcomes (number and total). Differences were resolved by discussion among co-authors. The abstracted data were entered into a database for analysis. We did not contact authors for further information. No systematic data extraction or analyses were conducted for qualitative components present in included studies with mixed designs (table 1).

Table 1

Characteristics of included Indian studies on Menstrual Hygiene Management published between 2000 and 2015

Study quality

Ad hoc quality assessments methods are detailed in online supplement S1. Quality assessments of included studies were conducted by the same reviewers on the basis of the following seven criteria: presence of a sample size calculation, randomness of sample, description and appropriateness of inclusion and exclusion criteria, presence of a description of the number of persons approached but not enrolled, or enrolled but data not used, completeness of outcome data for the number which was presented, presence of participant characteristics and of multivariate analysis for the outcome of the paper. The results were added to obtain an overall quality score ranging from 0 to 7 for each study. This quality score was not based on a pre-existing instrument, and has not been validated in other studies. Studies were not excluded on the basis of their quality.

Data synthesis

Prevalence was pooled as a proportion in a random-effects model (‘metaprop’, Stata V.13, StataCorp LP, College Station, USA) using the Freeman-Tukey double arcsine transformation and computation of the CI using the ‘exact method’.21 ,22 The extent of heterogeneity was measured using the I2, a measure of the proportion of total variability explained by heterogeneity rather than chance expressed as a percentage.23 To explore determinants of prevalence, we examined sources of heterogeneity across studies of the pooled prevalence (PP) estimates using random-effects meta-regression.24 Regression coefficients were presented as ORs with corresponding 95% CIs. We estimated between-study variance (τ2) using the algorithm of residual (restricted) maximum likelihood and calculated p values, and 95% CI for coefficients using the modification by Knapp and Hartung.25

Study-level predictors were included in the initial models if the p value for the univariate association was <0.2. Backwards elimination was conducted whereby variables were removed if the p value was >0.1 in the multivariate model (see online supplement 1, section S1.4). We examined the effect of study location (urban, rural, slum or combined), year of study, source of study population (community, school or other), region (North, Central, East, West and South), and if the study population was completely or only partially adolescents. For sensitivity analysis, we examined the effect of self-administered questionnaire versus study staff interview, study quality assessment as a continuous or dichotomous variable (quality score >4 vs ≤4), and the effect of random sampling using meta-regression. Quality scores were not used as weights in analyses.

Results

Characteristics and quality

We retrieved 145 studies through the database searches, and another 80 potentially eligible studies through reference lists. After exclusion and de-duplication, 138 were left (see online supplementary table S1.6). Most studies were in Maharashtra (24 studies; 17.4%) with a surge since 2010 (table 1 and figure 2). Studies were mostly of low-to-moderate quality (see online supplementary table S1.4 and S1.5). Frequently missing information was the number of refusals or exclusions; multivariate analyses were usually missing (90%). The sample size varied from small to very large (range 30–38 928, total 97 070), often without sample calculations (71.0%). In total, 19.6% of studies had five or more quality criteria fulfilled.

Figure 2

Flow chart of systematic review of MHM studies among adolescent girls in India. MHM, Menstrual Hygiene Management.

Premenarche awareness and sources of information

Among 88 studies with available information, the pooled prevalence of premenarche awareness was 48% (95% CI 43% to 53%, I2 98%, range 3–100%). In multivariate analysis, the prevalence was affected by setting, region and year of study with significantly higher awareness over time, and in the East and West of India compared to the North, and lower awareness in slum settings (see online supplementary table S2.2). Among girls aware prior to menarche, mothers were the most frequent source of information (PP 52%, 47% to 57%, I2 94%, n=43), followed by friends (PP 27%, 22% to 32%, I2 95%, n=37 studies). Other sources such as relatives (including sisters) and teachers were less commonly reported (table 2) and there were some regional differences (see online supplementary table S2.3).

Table 2

Pooled proportions of awareness of menarche, knowledge of menstruation, and sources of information about menarche and menstruation, overall and by setting, in Indian studies published between 2000 and 2015

Knowledge and perception of menstruation and knowledge resources

Overall, about a quarter of girls knew that the uterus is the source of bleeding (PP 23%, 16% to 30%, range 1–97%, I2 99%), and approximately half considered menstruation normal (PP 55%, 47% to 63%, range 6–98%, I2 99%, table 2). Mothers were most commonly mentioned as the knowledge source in 41 studies, with half of the girls reporting her as the main source (PP 54%, 45% to 63%, I2 99%, table 2). Friends and relatives were regularly mentioned with a PP of 24% and 14%, respectively, whereas teachers, media and health workers were uncommon resources with PPs of ≤10% (table 2).

Type of menstrual absorbents used

The use of absorbents was strikingly different by setting, with commercial pads significantly more common in urban areas, and cloths significantly more common in rural areas (table 3). Commercial pad use increased significantly over time (p<0.0001, online supplementary table S2.4 and figure 3). Cloth use was less common in school studies (PP 37%, 95% CI 29% to 45%, I2 99%, n=57) compared with community studies (PP 68, 95% CI 59% to 76%, I2 99%, n=38), independent of setting (meta-regression: p=0.007 for school vs community recruitment and p<0.001 for urban vs rural setting, online supplementary table S2.5). Some girls combined pad and cloth use, with a PP of 13% (95% CI 9% to 18%, I2 99%, n=42); this was higher among school studies (18%, 95% CI 13% to 24%, I2 98%, n=15) compared with community studies (PP 6%, 95% CI 2% to 11%, I2 98%, n=26, p<0.001, online supplementary table S2.5). One study in urban Tamil Nadu asked about materials inserted into the vagina (reported by 26.9%), but it was unclear if these were tampons.26 Only one study (in urban Karnataka) mentioned tampons, with five girls reportedly using them.27 No studies reported menstrual cups. Few studies mentioned contraceptives to postpone menstruation (ie, to attend events without menstrual discomfort).28 ,29 Economic considerations seemed to be the main reason for using cloths instead of pads; other reasons included difficulty with disposal, unawareness of pads, or personal preference (see online supplementary table S2.6).

Table 3

Pooled proportions of absorbents used, the disposal of the absorbent and use of a daily bath during menstruation, in Indian studies published between 2000 and 2015

Figure 3

Bubble plot with a fitted meta-regression line of the log prevalence of commercial pad use by adolescent girls over time, 104 studies in India published between 2000 and 2015. Circles are sized according to the precision of each estimate with larger bubbles for more precise estimates. One study was excluded15 because of the large sample size (≈39 000), which led to distortion of all other information.

Disposal of absorbents

Disposal in urban settings was mainly through routine waste and burning (table 3), while in rural settings burying and throwing away in public spaces was also common. Routine waste disposal was significantly more frequent in urban (PP 70%, 60% to 79%, I2 98%, n=16) compared to rural settings (PP 28%, 95% CI 19% to 38%, I2 99%, n=25, p<0.0001, online supplementary table S2.5). Burying was more common in community-based studies (46%, 34% to 57%, I2 99%, n=10) than school-based studies (PP 14%, 9% to 20%, I2 97%, n=13, p=0.003, online supplementary table S2.5). About 23% of girls threw the absorbent in open spaces, such as the roadside or in rivers and lakes; this was significantly higher in community-based studies (PP 35%, 24% to 46%, I2 99%, n=14) than in school-based studies (16%, 8% to 26%, I2 99%, n=18, p=0.001, online supplementary table S2.5).

Hygiene during menstruation

Most participants (84%, 95% CI 76% to 91%, range 2–99%, I2 99%, n=39) bathed daily during menstruation, with no difference between urban and rural settings; bathing was significantly less in one study in a slum (table 3). A subgroup of rural studies found that daily baths were less common during versus before or after menstruation.30–32 Other studies also noted bathing restrictions for girls during menstruation, due to fear that bathing might cause problems in future pregnancies, a scarcity of water, non-availability of bathing space, physical discomfort and lack of privacy.10 ,28 ,33–36

Restrictions

Restrictions during menstruation are common. The most frequent were restrictions in visiting places of worship, and touching religious items or praying (PP 77%, 71% to 83%, range 7–100, I2 99%, n=67), with no difference by setting (table 4) or over time (figure 4). Other common restrictions were food related (PP 38%, 30% to 46%, I2 99%, n=44), or touching people or special foods (PP 50%, 36% to 64%, I2 99%, n=19). In some studies, girls reported sleeping separately (PP 26%, 14% to 39%, I2 99%, n=20) or sitting separately from household members during menstruation (PP 24%, 7% to 46%, I2 98%, n=6). Girls faced restrictions in cooking, household work, exercise and playing, moving in and out of the house, and attending social functions (see table 4, online supplementary table S2.7 and figure S2.1 for a list of other reported beliefs and restrictions).

Table 4

Common restrictions related to menstruation in order of frequency of report in Indian studies published between 2000 and 2015

Figure 4

Bubble plot with fitted meta-regression line of the log prevalence of girls with religious restriction during menstruation over time, 67 studies in India published between 2000 and 2015. Circles are sized according to the precision of each estimate with larger bubbles for more precise estimates.

School absenteeism

Sixty-four studies reported on school absenteeism associated with menstruation, with one in four girls missing one or more school days during menstruation (PP 24%, 19% to 30%, I2 99%, table 5), with significant differences across regions (figure 5). Girls’ reasons for absence were physical discomfort or pain, lack of water, hygiene and disposal facilities in school toilets, fear of staining their clothes and restrictions imposed by relatives or teachers (see online supplementary table S2.8). No trend over time was seen (p=0.945, online supplementary table S2.9). In a univariate model, commercial pad use as a continuous variable was associated with a decrease in absenteeism (p=0.023, n=53, figure 6), but not in a multivariate model when adjusted for region (p=0.232). Similarly, cloth use was associated with an increase in absenteeism in a univariate (p=0.042, n=48) but not in a multivariate model (p=0.543). An average of just over a third (PP 37%, 29% to 46%, I2 98%, n=17) of girls reported changing their absorbent in school while others avoided this (table 5). Toilets at home were present in about half (PP 51%, 95% CI 36% to 67%, I2 99%, n=21) of the homes of the girls involved, with a significant difference between urban and rural settings (table 5).

Table 5

Reported school absenteeism related to menstruation, change of absorbent in school, and availability of a toilet at home, Indian studies published between 2000 and 2015

Figure 5

Tukey box plot of school absenteeism reported by adolescent girls during menstruation by region, 64 studies in India published between 2000 and 2015. The bottom and top of the box are the 25th centile and the 75th centile, and the band inside the box is the median. The lower whisker indicates the data between the 25th centile minus 1.5 times the difference between the 25th and 75th centiles, and the upper whisker indicates the data between the 75th centile plus 1.5 times the difference between the 25th and 75th centiles. The mean is indicated next or in the box plot, and the range of values is indicated under each region.

Figure 6

Bubble plot with fitted meta-regression line of the log prevalence of school absenteeism among adolescent girls and menstrual pad use, 53 studies in India published between 2000 and 2015. Circles are sized according to the precision of each estimate with larger bubbles for more precise estimates.

Sensitivity analyses

For several outcomes, the quality score or method of data collection made a difference, and was generally associated with a decrease in prevalence, for example, a higher quality score of a study with a lower awareness of menarche prior to it (see online supplementary table S2.2), and lower use of commercial pads (see online supplementary table S2.4); a random sample was associated with a lower prevalence of ‘throwing away’ the absorbent (see online supplementary table S2.5). A self-administered interview was associated with a lower prevalence of the use of media as a resource for knowledge on menstruation (see online supplementary table S2.3), and a lower prevalence of absenteeism (online online supplementary table S2.9).

Discussion

On the basis of this review, we estimate that about half of Indian adolescent girls started menarche unaware of its cause, with only a quarter understanding the source of bleeding. The majority of girls faced numerous barriers and restrictions; only one in eight girls faced no restriction at all. Commercial pads were more commonly used in urban settings or schools, with girls in rural areas and in community-based studies mainly dependent on cloths. About one in five girls disposed their soiled absorbents in inappropriate locations. A quarter of girls reported that they did not attend school during menstruation. Absenteeism due to menstruation did not decrease over time; school absence was inversely associated with the prevalence of pad use in univariate analysis, but not when adjusted for region.

Cloths are traditionally used to absorb menstrual flow; they are cheaper and environmentally less polluting, but are gradually being replaced by pads, particularly in urban areas. Cleaning and drying cloths is a problem if girls lack water, privacy and a drying place.10 ,37 Drying in the sun instead of damp cupboards or under other clothes is recommended for its microbiocidal effect, but girls prefer hiding cloths because of shame.38 Authors of the reviewed studies and the participants favoured commercial pads, but common use is prohibited by cost, particularly in rural areas (see online supplementary table S2.6). Our pooled estimate of pad use (45%) was higher than that in a separate report of 2010 where 12% of 1033 females sampled across India used pads, and compared with a national community-based survey conducted in 2007–2009 (10.7% among adolescents).15 ,39 Our review may represent persons with a higher socioeconomic status than the other studies because of the inclusion of school-based studies. The estimate on school absenteeism in the 2010 report (23%) was similar (24%).39

Insertable menstrual products such as menstrual cups and tampons were rarely mentioned in the reviewed studies, although there are local manufacturers. Menstrual cups may be economically advantageous given that one cup can last up to 10 years; they were acceptable for schoolgirls in Nepal40 and Kenya.41 The low use of insertable products may be related to concerns about virginity, despite invalidation of a connection between virginity and breaking the hymen.42

Disposal of commercial pads is a matter of concern because of their high content of non-biodegradable components. While the uncontrolled burning of soiled menstrual waste is common in some areas, in others it is culturally prohibited.43 Safe disposal will become a growing problem across India as more females turn to commercial pads, with the potential for 9000 tonnes of waste (for 432 million pads) annually.44 ,45 Commercial pad makers currently have not adapted their products to ensure safe disposal under all circumstances.

A gender equitable school environment is important for girls to engage in class and stay in school.46 ,47 India has an array of policies and schemes developed to provide pads, counselling from frontline workers, and the construction of toilets for girls.20 The number of separate and usable toilet facilities for girls has increased in India.48 ,49 Qualitative studies report that school absenteeism is associated with poor MHM interventions,50 ,51 but so far only WASH studies have shown an association between toilet improvement and absenteeism,52 ,53 and improved enrolment of adolescent girls when girls-only toilets were constructed.6 We detected a relationship between pad use and girls’ absenteeism in univariate analysis, but not when adjusted for region. This relationship may be confounded by socioeconomic status and WASH, as schools with a high prevalence of commercial pad use may also be more resourceful with investments for school toilets and cleaning. In our review, only one-third of girls reported using school toilets to change their menstrual absorbent. It is noted that inadequate toilets are not the only reason for menstrual-related absenteeism; physical discomfort was also frequently mentioned (see online supplementary table S2.10). The lack of toilets at home is of great concern with regard to safety, privacy and dignity, as reported repeatedly by women in India.54–56

This study has several limitations. There was high heterogeneity between studies as indicated by the I2 statistic, which was regularly over 90%. This may be explained by the different methodology of the studies and the different settings where the studies were conducted. We used meta-regression to explore factors that affected the outcomes, and indeed the setting (urban or rural), region, time and quality of the study were regularly associated with the outcomes examined (see online supplement S2).57 Not all studies reached scientific rigour, and states in the Central and Eastern region are under-represented as few studies have been conducted in these regions. To evaluate the potential effect of study quality, we assessed outcomes against the quality score and presence of random samples. Some outcomes were affected, for example, a higher quality score of a study was associated with a lower use of commercial pads and the pooled estimate may have overestimated the prevalence of commercial pad use. Studies were conducted by self-administered questionnaires or interviews by study staff; the latter may have led to a desirability effect, more so taking the age of respondents into account. A self-administered questionnaire was associated with a lower prevalence of absenteeism, so the pooled estimate for absenteeism may be overestimated. Studies were cross-sectional, so causality cannot be inferred. Further, our review was limited by the information available; not all included studies focused solely on MHM and not all studies presented basic information on age or socioeconomic status. This limited exploration of the effect of factors such as socioeconomic status, caste or maternal education on the outcomes. We aggregated the variety of responses around sources on menarche or menstruation and restrictions faced by girls where possible, and some may have been misclassified. Absence of school during menstruation was often not well defined. The quality of information on the reaction of girls to menarche or how a girl cleans herself during her period, the frequency of changing menstrual materials, and the obstructions girls face was generally too poor to use.

Although menarche is celebrated in some regions of India,10 ,33 ,58–60 our findings highlight that for the majority of girls, ‘menstruation poses a huge physical and psychological burden’.33 Societal beliefs and restrictions add to these negative experiences. While education could dispel some restrictions (eg, of foods or activities), beliefs and negative attitudes are deeply entrenched within Hindu and other religions.61 ,62 Innovative cultural and societal approaches will be required to achieve change.

Numerous studies report girls being caught unawares by menarche, and their subsequent feelings of stress, anxiety, depression, dirtiness and anger (eg, see online supplementary table S2.10). While the importance of puberty education is universally recognised, the question of who should educate girls is debated.63 India's National Health Mission programme has involved the female community health worker for this purpose with variable results,64 ,65 with mothers identified as the most frequent information source in this review. An MHM package thus needs to strengthen mothers’ practical MHM knowledge to support girls, while schools teach physiology. Many countries resolve this through age and culture appropriate sex and relationship packages in the school curricula, to familiarise children with puberty changes.66

The increasing number of publications on MHM in India is encouraging, showing an interest among researchers in India. Despite the caveats, our data suggest that such studies can provide data relevant for the development of MHM packages which support girls' menstrual needs; they illustrate the need to raise awareness, strengthen life skills education and improve WASH facilities and public health practices.

References

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Footnotes

  • Contributors AMvE and PAP-H conceived and designed the study. AMvE, MS and AB peformed the literature search and acquired the data. AMvE and PAP-H analysed and interpreted the data. AMvE and PAP-H wrote the first draft of the paper. MS, MBT, SC, AB and KFL critically revised subsequent drafts of the paper. All authors approved the final version.

  • Funding This review was funded by the Department of Foreign Affairs, Trade and Development (DFAD), Government of Canada through a grant to UNICEF. AMvE had full access to all data and had final responsibility for the decision to submit for publication.

  • Disclaimer The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement No additional data are available.

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