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