[1] Azienda Osped Pisana, UO Gastroenterol & Epatol, Pisa, Italy
[2] Scuola Normale Super Pisa, Pisa, Italy
[3] Osped Maggiore, IRCCS, Sci Direct, Milan, Italy
[4] Papageorgiou Gen Hosp, Pathol Clin, Thessaloniki, Greece
[5] Univ Cagliari, Div Clin Med 1, Cagliari, Italy
[6] G Papanikolaou Hosp, Dept Gastroenterol, Thessaloniki, Greece
[7] Henry Dunant Hosp, Dept Med & Hepatol, Athens, Greece
[8] Roche, Nutley, NJ USA
[9] Roche, Basel, Switzerland