[1] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Shizuoka, Japan
[2] Kyorin Univ, Dept Med Oncol, Fac Med, Tokyo, Japan
[3] Shizuoka Canc Ctr, Div Esophageal Surg, Shizuoka, Japan
[4] Natl Canc Ctr, Dept Head & Neck, Esophageal Med Oncol, Tokyo, Japan
[5] Kyoto Univ Hosp, Dept Clin Oncol, Kyoto, Japan
[6] Saitama Canc Ctr, Dept Gastroenterol, Saitama, Japan
[7] Keio Univ, Dept Surg, Sch Med, Tokyo, Japan
[8] Tokai Univ, Sch Med, Dept Surg Gastroenterol, Isehara, Kanagawa, Japan
[9] Natl Hosp Org Shikoku Canc Ctr, Dept Gastrointestinal Med Oncol, Matsuyama, Ehime, Japan
[10] Hyogo Canc Ctr, Dept Gastroenterol Oncol, Akashi, Hyogo, Japan
[11] Chiba Univ, Grad Sch Med, Dept Frontier Surg, Chiba, Japan
[12] Kumamoto Univ, Grad Sch Med Sci, Dept Gastroenterol Surg, Kumamoto, Japan
[13] Natl Hosp Org Kyushu Canc Ctr, Dept Gastroenterol Surg, Fukuoka, Japan
[14] Kansai Rosai Hosp, Amagasaki, Hyogo, Japan
[15] Natl Hosp Org Osaka Natl Hosp, Dept Gastroenterol & Hepatol, Osaka, Japan
[16] Natl Canc Ctr Hosp East, Dept Gastroenterol & Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[17] JCOG Data Ctr, Natl Canc Ctr Hosp, Operat Off, Tokyo, Japan
[18] Hamamatsu Univ Sch Med, Dept Surg, Hamamatsu, Shizuoka, Japan
[19] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan