1. Gastroenterology Department, Hospital Senhora da Oliveira, Guimarães, Portugal;
2. Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal;
3. ICVS/3B’s, PT Government Associate Laboratory, Guimarães/Braga, Portugal;
4. MEDCIDS – Department of Community Medicine, Information and Health Decision Sciences, Faculty of Medicine, University of Porto, Portugal;
5. CINTESIS – Center for Health Technology and Services Research, University of Porto, Porto, Portugal