[1] Kansai Rosai Hosp, Dept Gastrointestinal Surg, Amagasaki, Hyogo, Japan
[2] Natl Hosp Org Osaka Natl Hosp, Dept Surg, Osaka, Japan
[3] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[4] Saitama Canc Ctr, Ina, Saitama, Japan
[5] Chiba Canc Ctr, Chiba, Japan
[6] Shikoku Canc Ctr, Matsuyama, Ehime, Japan
[7] Hokkaido Univ Hosp, Div Canc Ctr, Digest Internal Med, Sapporo, Hokkaido, Japan
[8] Kyushu Univ, Grad Sch Med Sci, Dept Surg, Higashi Ku, Fukuoka, Japan
[9] Osaka Univ, Grad Sch Med, Suita, Osaka, Japan
[10] Yokohama City Univ, Sch Med, Yokohama, Kanagawa, Japan
[11] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan