[1] Aichi Canc Ctr Hosp, Dept Surg Gastroenterol, Chikusa Ku, Nagoya, Aichi 4648681, Japan
[2] Nagoya Univ, Grad Sch Med, Dept Gastroenterol Surg Surg 2, Nagoya, Aichi 4648601, Japan
[3] Nagoya Univ, Grad Sch Med, Ctr Adv Med & Clin Res, Nagoya, Aichi 4648601, Japan
[4] Komaki Municipal Hosp, Dept Surg, Komaki, Japan
[5] Ichinomiya Municipal Hosp, Dept Surg, Ichinomiya, Japan
[6] JA Konan Kosei Hosp, Dept Surg, Konan, Japan
[7] JA Kainan Hosp, Dept Surg, Yatomi, Japan
[8] Tokai Cent Hosp, Dept Surg, Kakamigahara, Japan
[9] Nagoya Mem Hosp, Dept Surg, Nagoya, Aichi, Japan
[10] Yokohama City Univ, Dept Biostat & Epidemiol, Yokohama, Kanagawa 232, Japan