[1] Univ Milan, Pathophysiol & Transplantat, Milan, Italy
[2] Univ Turin, Med Sci, Turin, Italy
[3] Fdn IRCCS Ca Granda, Internal Med, Milan, Italy
[4] Fdn IRCCS Ca Granda, Gastroenterol, Milan, Italy
[5] Univ Udine, Internal Med, I-33100 Udine, Italy
[6] Univ Palermo, Gastroenterol, Palermo, Italy
[7] Freeman Rd Hosp, Med, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England
[8] Univ Bern, Clin Res, Bern, Switzerland
[9] Catholic Univ, Internal Med, Rome, Italy
[10] Newcastle Univ, Cellular Med, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[11] Univ Turin, Gastroenterol, Turin, Italy