[1] Univ Occupat Environm Hlth, Dept Surg 1, Sch Med, Yahata Nishi Ku, Kitakyushu, Fukuoka 8078555, Japan
[2] Univ Occupat Environm Hlth, Dept Mol Biol, Sch Med, Kitakyushu, Fukuoka 8078555, Japan
[3] Univ Occupat Environm Hlth, Wakamatsu Hosp, Dept Gastroenterol & Gen Surg, Kitakyushu, Fukuoka 8080024, Japan