1. Department of Gastroenterology, 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. Department of Gastroenterology, Hospital do Divino Espírito Santo de Ponta Delgada, EPER, Ponta Delgada, Portugal
5. MEDCIDS – Department of Community Medicine, Information and Health Decision Sciences, Faculty of Medicine, University of Porto, Porto, Portugal
6. CINTESIS – Centre for Health Technology and Services Research, University of Porto, Porto, Portugal