[1] Yokohama City Univ, Grad Sch Med, Dept Gastroenterol & Hepatol, Yokohama, Kanagawa, Japan
[2] Yokohama City Univ, Grad Sch Med, Gastroenterol & Hepatol, Yokohama, Kanagawa, Japan
[3] Yokohama City Univ, Yokohama, Kanagawa, Japan
[4] Yokohama City Univ Med, Dept Gastroenterol & Hepatol, Yokohama, Kanagawa, Japan
[5] Yokohama City Univ Med, Int Clin Ctr Liver Dis, Yokohama, Kanagawa, Japan