[1] Osaka City Gen Hosp, Dept Clin Oncol, Osaka, Japan
[2] Kumamoto Univ, Grad Sch Med Sci, Dept Gastroenterol Surg, Kumamoto 860, Japan
[3] Tonan Hosp, KKR Sapporo Med Ctr, Dept Med Oncol, Sapporo, Hokkaido, Japan
[4] Kochi Med Sch Hosp, Canc Treatment Ctr, Kochi, Japan
[5] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Sci, Fukuoka 812, Japan
[6] Osaka Med Coll Hosp, Canc Chemotherapy Ctr, Osaka, Japan
[7] Gifu Grad Sch Med, Dept Surg Oncol, Gifu, Japan
[8] Univ Tokyo, Grad Sch Med, Dept Surg, Hepatobiliary Pancreat Surg Div, Tokyo 1138654, Japan
[9] Kobe Univ, Grad Sch Med, Dept Surg, Div Gastrointestinal Surg, Kobe, Hyogo, Japan
[10] Jikei Univ, Sch Med, Devis Clin Oncol Hematol, Dept Internal Med, Minato, Tokyo, Japan