1. Division of Gastroenterology; University of Pisa; Pisa Italy
2. Division of Gastroenterology; University of Padua; Padua Italy
3. Department of Gastroenterology; Academic Medical Centre Amsterdam; University of Amsterdam; Amsterdam The Netherlands
4. Division of Gastroenterology; Department of Internal Medicine (DIMI); University of Genoa; Genoa Italy
5. Division of Pharmacology and Chemotherapy; Department of Internal Medicine; University of Pisa; Pisa Italy