[1] Osaka Med Ctr Canc & Cardiovasc Dis, Gastrointestinal Oncol, Osaka, Japan
[2] Osaka Univ, Grad Sch Med, Dept Frontier Sci Canc & Chemotherapy, Osaka, Japan
[3] Kinki Univ, Osaka, Japan
[4] Saitama Canc Ctr Hosp, Dept Gastroenterol, Saitama, Japan
[5] Natl Hosp Org Shikoku Canc Ctr, Matsuyama, Ehime, Japan
[6] Kyushu Natl Canc Ctr, Dept Gastrointestinal & Med Oncol, Fukuoka, Fukuoka, Japan
[7] Keiyukai Sapporo Hosp, Dept Med Oncol, Sapporo, Hokkaido, Japan
[8] Chiba Canc Ctr, Div Gastroenterol, Chiba, Japan
[9] Hyogo Canc Ctr, Dept Gastroenterol Oncol, Akashi, Hyogo, Japan
[10] Japan Community Healthcare Org Kyushu Hosp, Dept Hematol Oncol, Kitakyushu, Fukuoka, Japan
[11] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Shizuoka, Japan
[12] Tokyo Womens Med Univ, Yachiyo Med Ctr, Yachiyoshi, Chiba, Japan
[13] Toyama Univ, Dept Gastroenterol & Hematol, Fac Med, Toyama, Japan
[14] St Marianna Univ Sch Med, Dept Clin Oncol, Kawasaki, Kanagawa, Japan
[15] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi, Japan
[16] Kyushu Univ, Fukuoka, Fukuoka, Japan
[17] Natl Canc Ctr, Gastrointestinal Med Oncol Div, Tokyo, Japan
[18] Univ Tsukuba, Div Gastroenterol, Tsukuba, Ibaraki, Japan
[19] Aichi Canc Ctr Hosp, Nagoya, Aichi, Japan