1. Gastroenterology Department, Faculty of Medicine, Centro Hospitalar Universitário S. João, Porto, Portugal
2. Ipatimup/i3S (Instituto de Investigação e Inovação em Saúde da Universidade do Porto), Porto, Portugal
3. Department of Hepatology and Gastroenterology, Edouard Herriot Hospital, Lyon, France
4. Department of Gastroenterology, Department of Clinical Medical Sciences, Hospital Universitario HM Montepríncipe, HM Hospitales, Universidad San Pablo-CEU, CEU Universities Madrid, Madrid, Spain
5. Gastroenterology and Digestive Endoscopy Unit, Azienda USL – IRCCS di Reggio Emilia, Reggio Emilia, Italy
6. Gastroenterology Department, Hospital de Poniente, Almería, Spain
7. Gastroenterology Department, Centro Hospitalar Lisboa Ocidental EPE, Lisbon, Portugal
8. Lisbon Advanced Endoscopic Center, Hospital Lusíadas, Lisbon, Portugal
9. Gastroenterology and Endoscopy Unit, Santa Chiara Hospital, Trento, Italy
10. Department of Internal Medicine I, University Clinics Salzburg, Paracelsus Medical University, Salzburg, Austria
11. Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, CUB Erasme Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
12. Navarrabiomed Research Institute, Complejo Hospitalario de Navarra, Public University of Navarra, IdiSNA, Pamplona, Spain
13. Digestive Endoscopy Service, Centro Médico Teknon, Barcelona, Spain
14. Gastroenterology Service, Hospital Universitario Germans Trias i Pujol, Barcelona, Spain
15. Gastroenterology Department, Hospital Santo António, Centro Hospitalar Universitário do Porto, Porto, Portugal
16. Gastroenterology Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
17. Department of Gastroenterology and Hepatology, Westmead Hospital, Sydney, Australia
18. Department of Community Medicine, Information and Decision in Health, Faculty of Medicine, University of Porto, Porto, Portugal
19. Pathology Department, Faculty of Medicine, Centro Hospitalar Universitário S. João, Porto, Portugal