[1] Tokyo Med & Dent Univ, Grad Sch, Dept Surg Oncol, Bunkyo Ku, Tokyo 1138519, Japan
[2] Natl Def Med Coll, Dept Surg, Tokorozawa, Saitama 359, Japan
[3] Hirosaki Univ, Sch Med, Dept Surg, Hirosaki, Aomori 036, Japan
[4] Toho Univ, Sch Med, Dept Surg Omori, Div Gen & Gastroenterol Surg, Tokyo, Japan
[5] Tokyo Womens Med Univ, Dept Surg 2, Tokyo, Japan
[6] Int Med Ctr Japan, Dept Surg, Tokyo, Japan
[7] Tokyo Metropolitan Komagome Hosp, Dept Surg, Tokyo, Japan
[8] Self Def Forces Cent Hosp, Dept Surg, Tokyo, Japan
[9] Canc Inst Hosp, Dept Surg, Tokyo, Japan
[10] Fujita Hlth Univ, Dept Surg, Toyoake, Aichi, Japan
[11] Aichi Canc Ctr Hosp, Dept Surg Gastroenterol, Nagoya, Aichi 464, Japan
[12] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Surg, Osaka, Japan
[13] Kurume Univ, Sch Med, Dept Surg, Kurume, Fukuoka 830, Japan