[1] McGill Univ, Div Gastroenterol & Hepatol, Hlth Ctr, 1650 Cedar Ave, Montreal, PQ H3G 1A4, Canada
[2] Prince Songkla Univ, Fac Med, Div Internal Med, Gastroenterol & Hepatol Unit, 15 Karnjanavanich Rd, Hat Yai 90110, Songkhla, Thailand
[3] Semmelweis Univ, Dept Oncol & Med, 1083, Korany Sandor u 2-a, H-1085 Budapest, Hungary