1. Division of Internal Medicine; Dept of Medical and Surgical Sciences; University of Bologna; S. Orsola-Malpighi Hospital; Bologna Italy
2. 1st Division of Gastroenterology; A.M. & A. Migliavacca Center for Liver Disease; Fondazione IRCCS Ca' Granda Maggiore Hospital; University of Milan Italy
3. Division of Medicine 6; Policlinico San Matteo Foundation; IRCCS; Pavia Italy
4. Department of Gastroenterology and Hepatology; Victor Babes University of Medicine and Pharmacy; Timisoara Romania
5. Department of Digestive Disease and Internal Medicine; Radiology Unit; General and University S. Orsola-Malpighi Hospital; Bologna Italy