[1] Nagoya Univ, Grad Sch Med, Dept Gastroenterol, Aichi, Japan
[2] Toranomon Gen Hosp, Dept Gastroenterol & Hepatol, Tokyo, Japan
[3] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Gastroenterol & Hepatol, Okayama, Japan
[4] Sapporo Kosei Gen Hosp, Dept Gastroenterol, Sapporo, Hokkaido, Japan
[5] Chiba Univ, Grad Sch Med, Dept Med & Clin Oncol, Chiba, Japan
[6] Kagawa Prefectural Cent Hosp, Dept Internal Med, Kagawa, Japan
[7] Kurume Univ, Sch Med, Dept Pathol, Fukuoka, Japan
[8] Nihon Univ, Sch Med, Dept Med, Div Gastroenterol & Hepatol, Tokyo, Japan
[9] Bristol Myers KK, Res & Dev, Tokyo, Japan
[10] Bristol Myers Squibb Co, Res & Dev, Princeton, NJ USA
[11] Univ Tokyo, Grad Sch Med, Dept Gastroenterol, Tokyo, Japan