[1] Kitasato Univ, East Hosp, Dept Gastroenterol Gastrointestinal Med Oncol, Sagamihara, Kanagawa 228, Japan
[2] Kitasato Univ, Sch Med, Dept Gastroenterol Gastrointestinal Oncol, Sagamihara, Kanagawa 228, Japan
[3] Natl Canc Ctr, Gastrointestinal Oncol Div, Tokyo, Japan
[4] Osaka Gen Med Ctr, Dept Surg, Osaka, Japan
[5] Osaka Med Coll Hosp, Ctr Canc Chemotherapy, Takatsuki, Osaka, Japan
[6] Natl Canc Ctr Hosp East, Div Gastrointestinal Oncol & Digest Endoscopy, Kashiwa, Chiba, Japan
[7] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Clin Oncol & Gastrointestinal Oncol, Osaka, Japan
[8] Shikoku Canc Ctr, Natl Hosp Org, Dept Internal Med, Matsuyama, Ehime, Japan
[9] Ibaraki Cent Hosp, Dept Gastroenterol, Kasama, Ibaraki, Japan
[10] Canc Inst Hosp JFCR, Dept Gastroenterol, Tokyo, Japan
[11] Aichi Canc Ctr Hosp, Dept Endoscopy, Nagoya, Aichi 464, Japan
[12] Kochi Hlth Sci Ctr, Kochi, Japan
[13] Sakai City Hosp, Dept Surg, Sakai, Osaka, Japan
[14] Hyogo Canc Ctr, Dept Gastroenterol Oncol, Akashi, Hyogo, Japan
[15] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Nagaizumi, Shizuoka, Japan
[16] Jichi Med Univ, Div Clin Oncol, Shimotsuke, Japan
[17] Saitama Canc Ctr, Div Gastroenterol, Ina, Saitama, Japan
[18] Kyoto Med Ctr, Natl Hosp Org, Dept Med Oncol, Kyoto, Japan
[19] Tokyo Univ Sci, Fac Engn, Tokyo 162, Japan
[20] Univ Tsukuba, Div Gastroenterol, Tsukuba, Ibaraki, Japan