1. Gastroenterology Unit, Department of Translational Research and New Technologies in Medicine and Surgery University of Pisa Pisa Italy
2. Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology University of Padua Padua Italy
3. Gastroenterology Unit, Department of Oncological Gastrointestinal Surgery S. Maria del Prato Hospital Feltre Italy
4. GSSI, Gran Sasso Science Institute L'Aquila Italy
5. Division of Surgery, Department of Surgery University of Campania Luigi Vanvitelli Caserta Italy
6. Gastroenterology Digestive Pathophysiology Unit Baggiovara Hospital Modena Italy
7. Division of Gastroenterology, Department of Internal Medicine (DIMI) University of Genoa Genoa Italy
8. Gastroenterology and Endoscopy Unit ‐ Department of Pathophysiology and Transplantation Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico ‐ University of Milan Milan Italy
9. Division of Gastroenterology University Washington University School of Medicine St. Louis Missouri USA