1. Department of Gastroenterology, Santa Luzia Hospital, Unidade Local de Saúde Alto Minho, Viana do Castelo, 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, Braga/Guimarães, Portugal
4. Department of Gastroenterology, Professor Doutor Fernando Fonseca Hospital, Amadora, Portugal
5. Department of Gastroenterology, Nova Medical School/Faculty of Medical Sciences, Lisbon, Portugal
6. Cintesis, Center for Health Technology and Services Research, Porto, Portugal
7. Digestive Endoscopy Unit, Agostino Gemelli University Hospital, Rome, Italy
8. Department of Gastroenterology, Portuguese Oncology Institute of Porto, Porto, Portugal