1 Gastroenterology, Hepatology and Digestive Endoscopy Section, Department of Medicine and Surgery, University of Perugia Medical School, Perugia; Gastroenterology Unit, S.Maria della Misericordia Hospital, Perugia, Italia. gabassot@tin.it.
2 Gastroenterology Unit, Department of Biomedical and Clinical Sciences, L.Sacco Hospital, University of Milano, Milano, Italy. gridavilla.daniele@asst-fbf-sacco.it.
3 Gastroenterology, Hepatology and Digestive Endoscopy Section, Department of Medicine and Surgery, University of Perugia Medical School, Perugia; Gastroenterology Unit, S.Maria della Misericordia Hospital, Perugia, Italia. olivia.morelli@unipg.it.
4 Gastroenterology Unit, Department of Biomedical and Clinical Sciences, L.Sacco Hospital, University of Milano, Milano, Italy. giovanni.maconi@unimi.it.