[1] Aichi Med Univ, Ctr Canc, Nagakute, Aichi, Japan
[2] Yamaguchi Univ, Dept Gastroenterol Breast & Endocrine Surg, Ube, Yamaguchi, Japan
[3] Rinku Gen Med Ctr, Dept Surg, Izumisano, Japan
[4] Kinki Cent Hosp, Dept Surg, Itami, Hyogo, Japan
[5] Matsunami Gen Hosp, Dept Surg, Hashima, Japan
[6] Hokkaido Canc Ctr, Dept Gastroenterol, Sapporo, Hokkaido, Japan
[7] Kochi Univ, Canc Treatment Ctr, Nankoku, Kochi, Japan
[8] Kitakyushu Gen Hosp, Kitakyushu, Fukuoka, Japan
[9] Univ Tokyo, Dept Epidemiol & Biostat, Tokyo, Japan
[10] Tokai Cent Hosp, Kakamigahara, Japan