[1] Kyushu Univ, Grad Sch Med Sci, Dept Med & Bioregulatory Sci, Higashi Ku, Fukuoka 8128582, Japan
[2] Saiseikai Fukuoka Gen Hosp, Dept Gastroenterol, Fukuoka 8128582, Japan
[3] Nakabaru Hosp, Dept Social Insurance, Fukuoka 8128582, Japan
[4] Fukuoka Higashi Med Ctr, Dept Gastroenterol, Fukuoka 8128582, Japan
[5] Kyushu Natl Canc Ctr, Div Gastroenterol, Fukuoka 8128582, Japan
[6] Kyushu Med Ctr, Natl Hosp Org, Fukuoka 8128582, Japan