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 Internal Medicine I, University Clinics Salzburg, Paracelsus Medical University, Salzburg, Austria.
4 Department of Hepatology and Gastroenterology, Edouard Herriot Hospital, Lyon, France.
5 Departamento de Gastroenterología, Departamento de Ciencias Médicas Clínicas, Hospital Universitario HM Montepríncipe, HM Hospitales, Universidad San Pablo-CEU, CEU Universities Madrid, Spain.
6 Gastroenterology and Digestive Endoscopy Unit, Azienda USL - IRCCS di Reggio Emilia, Reggio Emilia, Italy.
7 Gastroenterology Department, Hospital de Poniente, Almería, Spain.
8 Gastroenterology Department, Centro Hospitalar Lisboa Ocidental EPE, Lisbon, Portugal.
9 Lisbon Advanced Endoscopic Center, Hospital Lusíadas, Lisbon, Portugal.
10 Gastroenterology and Endoscopy Unit, Santa Chiara Hospital, Trento, Italy.
11 Department of Gastroenterology, Hepatopancreatology and Digestive Oncology, CUB Erasme Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium.
12 Complejo Hospitalario de Navarra, Navarrabiomed Research Institute, Public University of Navarra, IdiSNA, Pamplona, Spain.
13 Gastroenterology Department, Hospital Santo António, Centro Hospitalar Universitário do Porto, Porto, Portugal.
14 Gastroenterology Department, Centro Hospitalar de Vila Nova de Gaia/ Espinho, Vila Nova de Gaia, Portugal.
15 Department of Gastroenterology and Hepatology, Westmead Hospital, Sydney, Australia.
16 Department of Community Medicine, Information and Decision in Health, Faculty of Medicine, University of Porto, Porto, Portugal.
17 Pathology Department, Faculty of Medicine, Centro Hospitalar Universitário S. João, Porto, Portugal.