1. Gastroenterology and Digestive Endoscopy Unit, IRCCS Humanitas Research Hospital Department of Gastroenterology, Rozzano, Italy
2. Gastroenterology and Hepatology, Columbia University Medical Center, New York, United States
3. Center for Endoscopic Research and Therapeutics (CERT), The University of Chicago Medicine, Chicago, United States
4. Gastroenterology, Hospital Clinic de Barcelona, Barcelona, Spain
5. Gastroenterology, University of Foggia, Foggia, Italy