[1] Kanagawa Canc Ctr, Dept Gastrointestinal Surg, Asahi Ku, Yokohama, Kanagawa 2410815, Japan
[2] Kitakyushu Gen Hosp, Dept Surg, Kokuraminami, Kitakyusyu 8000295, Japan
[3] Hiroshima City Asa Hosp, Dept Surg, Kita Ku, Hiroshima 7310293, Japan
[4] Kochi Med Sch, Dept Surg, Nankoku, Kochi 7838505, Japan
[5] Aichi Hosp, Aichi Canc Ctr, Dept Surg Gastroenterol, Okazaki, Aichi 4440011, Japan
[6] Nagano Municipal Hosp, Dept Surg, Nagano 3818551, Japan
[7] Teikyo Univ, Sch Med, Dept Surg, Itabashi Ku, Tokyo 1738605, Japan
[8] Kanagawa Canc Ctr, Dept Pathol, Asahi Ku, Yokohama, Kanagawa 2410815, Japan
[9] Natl Canc Ctr, Ctr Canc Control & Informat Serv, Chuo Ku, Tokyo 1040045, Japan
[10] Hokkaido Univ Hosp, Translat Res & Clin Trial Ctr, Kita Ku, Sapporo, Hokkaido 0608648, Japan
[11] Tokai Cent Hosp, Kakamigahara 5048601, Japan