1. Division of Gastroenterology, General Hospital, IRCCS, San Giovanni Rotondo - Italy
2. Division of Gastroenterology, University of Padova, Padua - Italy
3. Division of Gastroenterology, AO San Giovanni Battista, Turin - Italy
4. Division of Gastroenterology, Ospedali Riuniti, Bergamo - Italy
5. Department of Pathology, University of Padova, Padua - Italy
6. Department of Internal Medicine, University of Genova, Genoa - Italy
7. Division of Nephrology, Maggiore Hospital, IRCCS, Milan - Italy