1. Territorial Gastroenterology Service, ASL BAT, Andria, Barletta-Andria-Trani, Italy;
2. Department of Medical and Surgical Sciences, School of Medicine, Catholic University, Rome, Italy;
3. Department of Biomedical Sciences, Humanitas University, Milan, Italy;
4. IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy;
5. Division of Internal Medicine and Gastroenterology, “Cristo Re” Hospital, Rome, Italy;
6. Department of Medical and Surgical Sciences, Gastroenterology Unit, University of Parma, Parma, Italy;
7. Division of Gastroenterology, “S. Camillo” Hospital, Rome, Italy;
8. Division of Surgery, “P. Colombo” Hospital, ASL RM6, Velletri, Rome, Italy;
9. Division of Gastroenterology, “Santa Caterina Novella” Hospital, Galatina, Lecce, Italy;
10. Division of Gastroenterology, “San Donato” Hospital, San Donato Milanese, Michigan, Italy;
11. Institute of Gastroenterology and Digestive Endoscopy, Goiânia, Goiás, Brazil;
12. Department of Medicine and Surgery, Gastroenterology and Hepatology Unit, “Santa Maria Della Misericordia” University Hospital, University of Perugia, Perugia, Italy;
13. Division of Gastroenterology, “T. Maresca” Hospital, Torre Del Greco, Naples, Italy;
14. Digestive Endoscopy Unit, “San Matteo Degli Infermi” Hospital, Spoleto, Perugia, Italy;
15. Digestive Endoscopy Unit, “Sant’Agostino Estense” Hospital, Baggiovara, Missouri, Italy;
16. 2nd Medical Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, Cluj-Napoca, Romania;
17. Central University of Venezuela, Loira Medical Center, Caracas, Venezuela;
18. Service of Digestive Endoscopy, “Villa Dei Pini” Home Care, Civitanova Marche, Macerata, Italy;
19. Digestive Endoscopy Unit, “Santa Maria Goretti” Hospital, Latina, Italy;
20. Digestive Endoscopy Unit, ULSS7 Alto Vicentino, Santorso, Virgin Islands, Italy;
21. Division of Gastroenterology and Digestive Endoscopy “S. Giovanni-Addolorata” Hospital, Rome, Italy;
22. Department of Medicine II, Saarland University Medical Center, Homburg, Germany;
23. Health Sciences, Hannover Medical School (MHH), Hannover, Germany;
24. Division of Gastroenterology, Hepatology and Nutrition, San Salvatore Hospital, Department of Life, Health & Environmental Sciences, University of L'Aquila, L'Aquila, Italy;
25. Division of Gastroenterology, “L. Sacco” University Hospital, Milan, Italy;
26. Department of Clinical Medicine and Surgery, Division of Gastroenterology and Hepatology, Federico II” University Hospital, Naples, Italy;
27. Department of Anorectal Physiology, “São José” Home Care, Rio de Janeiro, Brazil;
28. Department of Colorectal Surgery, Federal University of Goiás, Goiânia, Goiás, Brazil;
29. Department of Colorectal Surgery, King's College Hospital, London, United Kingdom;
30. Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education and Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland;
31. 1st Division of General Surgery, “Umberto I” University Hospital, “Sapienza” University, Rome, Italy;
32. Institute of Clinical Medicine, Vilnius University Hospital, Vilnius, Lithuania;
33. Digestive Endoscopy Unit, “Valle D'Itria” Hospital, Martina Franca, Taranto, Italy;
34. Division of Gastroenterology, “Pugliese-Ciaccio” Hospital, Catanzaro, Italy;
35. Digestive Endoscopy Unit, “F. Perinei,” Altamura, Bari, Italy;
36. Division of Internal Medicine and Gastroenterology, IRCCS “A. Gemelli” Hospital, Fondazione Policlinico Gemelli, Catholic University, Rome, Italy;
37. Division of Gastroenterology and Digestive Endoscopy, “Bucchieri-La Ferla” Hospital, Palermo, Italy;
38. Division of Gastroenterology, “Belcolle” Hospital, Viterbo, Italy;
39. Division of Gastroenterology, “Nuovo Regina Margherita” Territorial Hospital, Rome, Italy;
40. Department of Surgery, “Sapienza” University of Rome-Polo Pontino, Terracina, Latina, Italy;
41. Gastroenterology and Endoscopy, IRCCS Ospedale “San Raffaele” and University “Vita-Salute San Raffaele,” Milan, Italy.