1. Gastroenterology Department, Centro Hospitalar São João, Porto, Portugal
2. Digestive Endoscopy Unit, Humanitas Research Hospital, Rozzano, Milan; Humanitas University, Rozzano, Milan, Italy
3. Department of Gastroenterology and Hepatology, Hôpital Privé des Peupliers Paris, France
4. Department of Gastroenterology Hepatopancreatology, and Digestive Oncology, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium
5. Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
6. Department of Surgery, University of Pernambuco, Recife, Pernambuco, Brazil
7. Herbert Wertheim College of Medicine at Florida International University, Department of Surgery, Miami, Florida, United States
8. Department of Gastroenterology & Hepatology, CHU Saint Pierre, Université Libre de Bruxelles, Brussels, Belgium
9. Department of Medicine and Division of Gastroenterology and Hepatology, The Johns Hopkins Medical Institutions, Baltimore, Maryland, United States