[1] Natl Hosp Org Osaka Natl Hosp, Dept Surg, Osaka, Japan
[2] Natl Canc Ctr Hosp East, Kashiwa, Japan
[3] Natl Canc Ctr Hosp, Dept Gastrointestinal Med Oncol, Chuo, Japan
[4] Kinki Univ, Dept Med Oncol, Sch Med, Osaka, Japan
[5] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Japan
[6] Hokkaido Univ Hosp, Div Canc Ctr, Sapporo, Japan
[7] Kanagawa Canc Ctr, Dept Gastrointestinal Surg, Yokohama, Japan
[8] St Marianna Univ, Dept Clin Oncol, Sch Med, Kawasaki, Japan
[9] Kanazawa Univ Hosp, Kanazawa, Japan
[10] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Onc, Kashiwa, Japan
[11] Natl Canc Ctr, Tokyo, Japan
[12] Natl Hosp Org Osaka Natl Hosp, Osaka, Japan
[13] Osaka Med & Pharmaceut Univ Hosp, Takatsuki, Japan
[14] Ono Pharmaceut, Osaka, Japan