[1] Kobe Univ, Grad Sch Med, Dept Internal Med, Div Gastroenterol, Kobe, Hyogo, Japan
[2] Yodogawa Christians Hosp, Dept Gastroenterol, Osaka, Japan
[3] Fukui Red Cross Hosp, Dept Gastroenterol, Fukui, Japan
[4] Kyoto Second Red Cross Hosp, Dept Hlth Care, Kyoto, Japan
[5] Kakogawa East City Hosp, Dept Gastroenterol, Kakogawa, Hyogo, Japan
[6] Kita Harima Med Ctr, Dept Gastroenterol, Ono, Hokkaido, Japan
[7] Saiseikai Nakatsu Hosp, Dept Gastroenterol, Osaka, Japan