[1] McGill Univ, Hlth Ctr, Dept Med, Div Gastroenterol & Hepatol, Montreal, PQ, Canada
[2] McGill Univ, Dept Med, Hlth Ctr, Montreal, PQ, Canada
[3] Prince Songkla Univ, Fac Med, Div Internal Med, Gastroenterol & Hepatol Unit, Hat Yai, Songkhla, Thailand
[4] Semmelwe Univ, Dept Med, Budapest, Hungary