[1] Shinshu Univ, Sch Med, Dept Med, Div Gastroenterol, Matsumoto, Nagano 3908621, Japan
[2] Toranomon Gen Hosp, Dept Hepatol, Tokyo, Japan
[3] Tokyo Womens Med Univ, Dept Internal Med & Gastroenterol, Tokyo, Japan
[4] Nagoya City Univ, Grad Sch Med Sci, Dept Virol, Nagoya, Aichi, Japan
[5] Nagoya City Univ, Grad Sch Med Sci, Liver Unit, Nagoya, Aichi, Japan
[6] Nagoya Daini Red Cross Hosp, Gastroenterol Sect, Nagoya, Aichi, Japan
[7] Hokkaido Univ, Grad Sch Med, Dept Gastroenterol & Hepatol, Sapporo, Hokkaido, Japan
[8] Sapporo Kosei Gen Hosp, Dept Gastroenterol, Sapporo, Hokkaido, Japan
[9] NHO Nagasaki Med Ctr, Clin Res Ctr, Omura, Japan
[10] Hiroshima Univ, Grad Sch Biomed Sci, Program Biomed Res, Div Frontier Med Sci,Dept Med & Mol Sci, Hiroshima, Japan
[11] Chiba Univ, Grad Sch Med, Dept Med & Clin Oncol, Chiba, Japan
[12] Hyogo Coll Med, Dept Internal Med, Div Hepatobiliary & Pancreat Dis, Nishinomiya, Hyogo, Japan
[13] Osaka Univ, Grad Sch Med, Dept Gastroenterol & Hepatol, Osaka, Japan