1. Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy
2. Division of Gastroenterology, Department of Internal Medicine, University of Pisa, Pisa, Italy
3. Division of Gastroenterology, Department of Internal Medicine, University of Genoa, Genoa, Italy
4. Division of Pharmacology and Chemotherapy, University of Pisa, Pisa, Italy