[1] Kagawa Univ Hosp, Dept Med Oncol, Takamatsu, Kagawa, Japan
[2] Japanese Red Cross Ishinomaki Hosp, Dept Med Oncol, Ishinomaki, Japan
[3] Tokyo Metropolitan Canc & Infect Dis Ctr Komagome, Dept Surg, Tokyo, Japan
[4] Kobe City Nishi Kobe Med Ctr, Dept Surg, Kobe, Hyogo, Japan
[5] Saga Univ Hosp, Div Hematol Resp Med & Oncol, Saga, Japan
[6] Japan Community Healthcare Org Kyushu Hosp, Dept Hematol Oncol, Kitakyushu, Fukuoka, Japan
[7] Toyonaka City Hosp, Dept Surg, Toyonaka, Osaka, Japan
[8] Nihon Univ, Itabashi Hosp, Dept Digest Surg, Tokyo, Japan
[9] Natl Hosp Org Hokkaido Canc Ctr, Div Gastroenterol, Sapporo, Hokkaido, Japan
[10] Sano Hosp, Gastrointestinal Canc Ctr, Kobe, Hyogo, Japan
[11] Showa Univ Hosp, Div Med Oncol, Tokyo, Japan
[12] St Marianna Univ, Dept Clin Oncol, Sch Med, Kawasaki, Kanagawa, Japan
[13] Showa Univ, Fujigaoka Hosp, Div Clin Oncol, Dept Internal Med, Yokohama, Kanagawa, Japan
[14] Aizawa Hosp, Aizawa Comprehens Canc Ctr, Matsumoto, Nagano, Japan
[15] Kitasato Univ, Sch Pharm, Dept Clin Med Biostat, Tokyo, Japan
[16] Showa Univ, Fujigaoka Hosp, Div Med Oncol, Yokohama, Kanagawa, Japan
[17] Nihon Univ, Sch Med, Dept Digest Surg, Tokyo, Japan