[1] Kyoto Univ, Grad Sch Med, Dept Gastroenterol & Hepatol, Kyoto, Japan
[2] Kobe City Med Ctr Gen Hosp, Dept Pathol, Kobe, Hyogo, Japan
[3] Kobe City Med Ctr Gen Hosp, Dept Gastroenterol, Kobe, Hyogo, Japan
[4] Kobe City Med Ctr Gen Hosp, Dept Hepatol, Kobe, Hyogo, Japan