[1] Hiroshima Univ Hosp, Canc Treatment Ctr, Hiroshima, Japan
[2] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[3] Kanagawa Canc Ctr, Gastrointestinal Surg, Yokohama, Kanagawa, Japan
[4] Hokkaido Univ Hosp, Dept Canc Chemotherapy, Canc Ctr, Sapporo, Hokkaido, Japan
[5] Chiba Canc Ctr Hosp, Div Gastroenterol, Chiba, Japan
[6] Saitama Canc Ctr, Dept Gastroenterol, Saitama, Japan
[7] Kansai Rosai Hosp, Surg, Amagasaki, Hyogo, Japan
[8] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan
[9] Kindai Univ, Dept Med Oncol, Fac Med, Osaka, Japan
[10] Natl Kyushu Canc Ctr, Dept Gastrointestinal & Med Oncol, Fukuoka, Fukuoka, Japan
[11] Shikoku Canc Ctr, Dept Gastrointestinal Med Oncol, Matsuyama, Ehime, Japan
[12] St Marianna Univ, Clin Oncol, Sch Med, Kawasaki, Kanagawa, Japan
[13] Kyushu Univ, Surg & Sci, Fukuoka, Fukuoka, Japan
[14] Univ Tsukuba, Gastroenterol, Fac Med, Tsukuba, Ibaraki, Japan
[15] Osaka Natl Hosp, Dept Surg, Osaka, Japan
[16] Kyorin Univ Hosp, Med Oncol, Tokyo, Japan
[17] Osaka Univ, Fac Med, Grad Sch Med, Dept Frontier Sci Canc & Chemotherapy, Suita, Osaka, Japan
[18] Natl Canc Ctr Hosp East, Clin Res Support Off, Kashiwa, Chiba, Japan
[19] Saitama Canc Ctr, Mol Diag & Canc Prevent, Saitama, Japan