1. Faculty of Medicine, University of Porto, Porto, Portugal
2. Pain Unit at Maputo Central Hospital, Maputo Central Hospital, Maputo, Mozambique
3. Center for Health Technology and Services Research (CINTESIS), University of Porto, Porto, Portugal
4. Health Information and Decision Sciences Department - MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal
5. Faculty of Medicine, Eduardo Mondlane University, Maputo, Mozambique