1. Department of Hepatogastroenterology; IKEM; Prague Czech Republic
2. Division of Gastroenterology and Hepatology; National Center for Global Health and Medicine; Tokyo Japan
3. Division of Gastroenterology, Department of Internal Medicine; University of Genoa; Genoa Italy
4. Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology; University of Padua; Padua Italy
5. Department of Surgery; Diakonessenhuis Utrecht; Utrecht the Netherlands
6. Department of Upper Gastrointestinal Tract Disorders; Clinical Scientific Centre; Moscow Russia
7. Department of Surgery; University Medical Center Utrecht; Utrecht the Netherlands
8. Division of Gastroenterology and Hepatology; Stanford University, Stanford; California