[1] Natl Canc Ctr, Gastrointestinal Med Oncol Div, Tokyo, Japan
[2] Kitasato Univ Hosp, Dept Gastroenterol, Sagamihara, Kanagawa, Japan
[3] Osaka Gen Med Ctr, Dept Surg, Osaka, Japan
[4] Osaka Med Coll Hosp, Canc Chemotherapy Ctr, Takatsuki, Osaka, Japan
[5] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[6] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Clin Oncol, Osaka, Japan
[7] Natl Hosp Org, Shikoku Canc Ctr, Dept Gastrointestinal Med Oncol, Matsuyama, Ehime, Japan
[8] Ibaraki Cent Hosp, Dept Gastroenterol, Kasama, Ibaraki, Japan
[9] Canc Inst Hosp JFCR, Dept Gastroenterol, Tokyo, Japan
[10] Aichi Canc Ctr Hosp, Dept Endoscopy, Nagoya, Aichi, Japan
[11] Kagawa Univ, Dept Clin Oncol, Takamatsu, Kagawa, Japan
[12] Sakai City Hosp, Dept Surg, Sakai, Osaka, Japan
[13] Hyogo Canc Ctr, Dept Gastroenterol Oncol, Akashi, Hyogo, Japan
[14] Shizuoka Canc Ctr, Diyis Gastrointestinal Oncol, Shizuoka, Japan
[15] Jichi Med Univ, Dept Clin Oncol, Shimotsuke, Tochigi, Japan
[16] Saitama Canc Ctr, Div Gastroenterol, Saitama, Japan
[17] Natl Hosp Org, Dept Med Oncol, Kyoto Med Ctr, Kyoto, Japan
[18] Chiba Canc Ctr, Clin Trial Promot Dept, Chiba, Japan
[19] Showa Univ, Dept Internal Med, Northern Yokohama Hosp, Tokyo, Japan
[20] Univ Tsukuba, Div Gastroenterol, Tsukuba, Ibaraki, Japan
[21] Natl Ctr Global Hlth & Med, Comprehens Canc Ctr, Shinjuku Ku, Tokyo, Japan
[22] Hamamatsu Univ, Dept Med Oncol, Sch Med, Hamamatsu, Shizuoka, Japan