[1] Kitano Hosp, Tazuke Kofu Kai Med Res Inst, Dept Gastroenterol Surg & Oncol, Osaka, Japan
[2] Osaka Univ, Grad Sch Med, Dept Surg, Suita, Osaka, Japan
[3] Yamaguchi Univ, Grad Sch Med, Dept Gastroenterol Breast & Endocrine Surg, Yamaguchi, Japan
[4] Osaka Int Canc Inst, Dept Surg, Osaka, Japan
[5] Osaka Univ, Dept Frontier Sci Canc & Chemotherapy, Grad Sch Med, Suita, Osaka, Japan
[6] Hyogo Coll Med, Dept Surg, Nishinomiya, Hyogo, Japan
[7] Kyoto Univ, Dept Surg, Grad Sch Med, Kyoto, Japan
[8] Kobe Univ, Grad Sch Med, Div Hepatobiliary Pancreat Surg, Dept Surg, Kobe, Hyogo, Japan
[9] Gen Hosp, Kobe City Med Ctr, Dept Med Oncol, Kobe, Hyogo, Japan
[10] Kindai Univ, Fac Med, Dept Surg, Osakasayama, Japan
[11] Ehime Univ, Dept Hepatobiliary Pancreat & Breast Surg, Grad Sch Med, Touon, Japan
[12] Otsu Red Cross Hosp, Dept Surg, Otsu, Shiga, Japan
[13] Natl Hosp Org Kyoto Med Ctr, Dept Surg, Kyoto, Japan
[14] Kyoto Univ, Dept Biomed Stat & Bioinformat, Grad Sch Med, Kyoto, Japan
[15] Osaka Int Canc Inst, Dept Canc Survey & Gatrointestinal Oncol, Osaka, Japan