[1] Aichi Canc Ctr Hosp, Dept Surg Gastroenterol, Nagoya, Aichi 4648681, Japan
[2] Komaki Municipal Hosp, Dept Surg, Komaki, Japan
[3] Aichi Med Univ, Dept Surg Gastroenterol, Nagakute, Aichi 48011, Japan
[4] Aichi Hosp, Dept Surg Gastroenterol, Aichi Canc Ctr, Okazaki, Aichi, Japan
[5] Nagoya Med Ctr, Dept Surg, Nagoya, Aichi, Japan
[6] Tosei Gen Hosp, Dept Surg, Seto, Japan
[7] Ichinomiya Municipal Hosp, Dept Surg, Ichinomiya, Japan
[8] Yokohama City Univ, Grad Sch Med, Dept Biostat & Epidemiol, Yokohama, Kanagawa 232, Japan
[9] Nagoya Univ, Grad Sch Med, Dept Gastroenterol Surg Surg 2, Nagoya, Aichi 4648601, Japan