1. Gedyt Endoscopy Center, Buenos Aires, Argentina
2. Division of Gastroenterology, Casa Sollievo Sofferemza Hospital, IRCCS, San Giovanni Rotondo, Italy
3. Division of Gastroenterology, Medical University of South Carolina, Charleston, South Carolina, USA
4. Division of Gastroenterology and Gastrointestinal Endoscopy, Vita-Salute San Raffaele University, Scientific Institute San Raffaele, Milan, Italy
5. Department of Gastroenterology, HELIOS Albert-Schweitzer Klinik, Göttingen University Teaching Hospital, Northeim, Germany
6. Departments of Gastroenterology and Hepato-Pancreatology, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium
7. Department of Gastroenterology, Silesian Academy of Medicine, Medyków, Katowice, Poland
8. Division of Gastroenterology and Hepatology, University of North Carolina, Chapel Hill, North Carolina, USA
9. Digestive Endoscopy Unit, Catholic University, Rome, Italy
10. Department of Gastroenterology and Hepatology, Elisabethinen Hospital, Linz, Austria