[1] Osaka Natl Hosp, Osaka, Japan
[2] Hiroshima Univ, Hiroshima, Japan
[3] Nihon Univ Sch Med, Tokyo, Japan
[4] Yokohama City Univ, Gastroenterol Ctr, Yokohama, Kanagawa 232, Japan
[5] Kobe City Med Ctr Gen Hosp, Kobe, Hyogo, Japan
[6] Gifu Univ Sch Med, Gifu, Japan
[7] Hakodate Goryokaku Hosp, Hakodate, Hokkaido, Japan
[8] Gunma Univ Sch Med, Maebashi, Gunma, Japan
[9] Sakai City Hosp, Sakai, Osaka, Japan
[10] Gifu Univ Sch Med, Dept Surg Oncol, Gifu, Japan
[11] Kobe Univ, Dept Gastrointestinal Surg, Kobe, Hyogo 657, Japan
[12] Natl Def Med Coll Hosp, Tokorozawa, Saitama, Japan
[13] Japanese Fdn Canc Res, Canc Inst Hosp, Tokyo, Japan
[14] Shizuoka Canc Ctr, Nagaizumi, Shizuoka, Japan
[15] Kitasato Univ Sch Pharm, Tokyo, Japan
[16] Japan Clin Canc Res Org, Tokyo, Japan