1. Gastroenterology Service, Azienda Sanitaria Locale Barletta-Andria-Trani, Andria, Italy
2. Division of Internal Medicine and Gastroenterology, Cristo Re Hospital, Rome, Italy
3. Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
4. Division of Gastroenterology, Istituto di Rocovero e Cura a Carattere Scientifico San Donato, San Donato Milanese, Italy
5. Instituto Goiano de Gastroenterologia e Endoscopia digestiva, Faculdade de Medicina da Universidade Federal de Goiás, Goiânia, Brasil
6. Division of Gastroenterology, T. Maresca Hospital, Torre del Greco, Italy
7. Digestive Endoscopy Unit, San Matteo degli Infermi Hospital, Spoleto, Italy
8. Division of Digestive Endoscopy, Sant’Agostino Estense Hospital, Baggiovara, Italy
9. Humanitas University, IBD Center, Humanitas Clinical and Research Hospital, Via Manzoni, Rozzano, Milan, Italy
10. Service of Territorial Gastroenterology, Feltre, Italy
11. Division of Gastroenterology, Azienda Sanitaria Locale Azienda Sanitaria Locale Roma H., Rome, Italy
12. Loira Medical Center, Universidad Central de Venezuela, Caracas, Venezuela
13. Division of Gastroenterology, Belcolle Hospital, Viterbo, Italy
14. Service of Gastroenterology and Digestive Endoscopy, Villa dei Pini Home Care, Civitanova, Marche, Italy
15. Division of Digestive Endoscopy, S. Maria Goretti Hospital, Latina, Italy
16. Division of Gastroenterology, S. Salvatore Hospital, L’Aquila, Italy
17. Service of Digestive Endoscopy, S. Camillo Hospital, Rome, Italy
18. Department of Surgery, Federal University of Goiás, Goiânia, Brasil
19. Division of Internal Medicine and Gastroenterology, C.I. Columbus Catholic University, Rome, Italy
20. Division of Gastroenterology, S. Paolo Hospital, Bari, Italy
21. Department of Biomedical Sciences and Human Oncology, University of Bari Medical School, Bari, Italy
22. Department of Gastrointestinal Surgery, Stavanger University Hospital, University of Bergen, Bergen, Norway
23. Division of Gastroenterology and Digestive Endoscopy, Padre Pio Hospital, Vasto, Italy
24. Division of Gastroenterology, Monserrato University Hospital, University of Cagliari, Cagliari, Italy
25. Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
26. Laboratory of Clinical Pharmacology, University of Parma, Parma, Italy
27. Division of Surgery, P. Colombo Hospital, Rome, Italy