1 Multidisciplinary Pain Centre, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark Cancer Pain Unit, Skåne Oncology Clinic, Lund University and Lund University Hospital, Lund, Sweden Section of Acute Pain Management and Palliative Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark School of Nursing, University of Sao Paulo, Sao Paulo, Brazil The State of Sao Paulo Research Foundation, Sao Paulo, Brazil.