[1] Kurume Univ, Dept Med, Div Gastroenterol, Sch Med, 67 Asahi Machi, Kurume, Fukuoka 8300011, Japan
[2] Kurume Univ Hosp, Inflammatory Bowel Dis Ctr, Kurume, Fukuoka, Japan
[3] Kurume Univ, Biostat Ctr, Sch Med, Kurume, Fukuoka, Japan
[4] Kurume Univ Hosp, Dept Diagnost Pathol, Kurume, Fukuoka, Japan