[1] Prefectural Hiroshima Hosp, Dept Gen Internal Med, Hiroshima, Japan
[2] Kawasaki Med Sch Med, Dept Internal Med, Div Gastroenterol, Sch Med, Kurashiki, Okayama 7010192, Japan
[3] Kawasaki Med Sch Med, Dept Surg, Sch Med, Kurashiki, Okayama 7010192, Japan
[4] Tottori Prefectural Cyuo Hosp, Dept Internal Med, Tottori, Japan
[5] Soryo Municipal Clin, Syobara, Japan