1. Institute of Gastroenterology and Liver Diseases, Ha'Emek Medical Center, Afula, Israel
2. Gedyt Endoscopy Center, Buenos Aires, Argentina
3. Departments of Internal Medicine and Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
4. University of Zaragoza, Aragon Health Research Institute (IIS Aragon), CIBERehd, Spain
5. Department of Gastroenterology, Sheffield Teaching Hospitals, United Kingdom
6. Division of Gastroenterology and Digestive Endoscopy, Maresca Hospital, Torre del Greco, Italy
7. Department of Gastroenterology and Hepatology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
8. Department of Gastroenterology, IPO Porto, Portugal and CINTESIS, Porto Faculty of Medicine, Portgal
9. Division of Gastroenterology, Hospital Curto, Polla, Italy
10. First Department of Internal Medicine and Gastroenterology, Petz Aladar, Hospital, Gyor, Hungary
11. Department of Surgical Sciences, University of Torino, Torino, Italy
12. Institute and Polyclinic for Diagnostic Radiology, University Hospital Dresden-TU, Dresden, Germany
13. Department of Gastroenterology, Ambroise Paré Hospital, Boulogne, France
14. Department of Biomedical and Clinical Sciences, University of Milan, Gastroenterology Unit, Luigi Sacco University Hospital, Milan, Italy
15. Department of Medical Gastroenterology, Rikshospitalet University Hospital, Oslo, Norway
16. Department of Gastroenterology, Royal Wolverhampton Hospitals NHS Trust, Wolverhampton, United Kingdom
17. Department of Gastroenterology, Valduce Hospital, Como, Italy
18. Department of Gastroenterology, Centro Hospitalar do Porto, Portugal
19. Department of Gastroenterology, Centro Hospitalar e Universitário de Coimbra, Portugal
20. Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy
21. Gastroenterology and Endoscopy Department, Antonio Cardarelli Hospital, Naples, Italy
22. Digestive Endoscopy Unit, Catholic University, Rome, Italy