1. Department of Gastroenterology and Hepatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
2. Department of Gastroenterology, Evangelisches Krankenhaus Düsseldorf, Düsseldorf, Germany
3. Department of Gastroenterology, Helios Klinikum Krefeld, Düsseldorf, Germany
4. Institute of Digestive Disease, Department of Surgery, The Chinese University of Hong Kong, Hong Kong, China
5. Institute of Digestive Disease, Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hongkong, China
6. Digestive Endoscopy Unit, Agostino Gemelli University Hospital, Universita Cattolica del Sacro Cuore, Rome, Italy
7. IHU IAS Strasbourg University, Strasbourg, France
8. Feinberg School of Medicine, Northwestern University, Chicago, Illinois