[1] Toho Univ, Omori Med Ctr, Dept Gen & Gastroenterol Surg, Tokyo, Japan
[2] Tokyo Metropolitan Hiroo Gen Hosp, Dept Surg, Tokyo, Japan
[3] Teikyo Univ Hosp, Dept Surg, Mizonokuchi, Kanagawa, Japan
[4] Sano City Hosp, Dept Surg, Sano City, Tochigi, Japan
[5] Bell Land Gen Hosp, Dept Surg, Sakai, Japan
[6] Inst Sci Tokyo, Dept Gastrointestinal Surg, Tokyo, Japan
[7] Natl Def Med Coll, Dept Surg, Tokorozawa, Japan
[8] Fujita Hlth Univ Hosp, Int Med Ctr, Toyoake, Japan
[9] Yamagata Prefectural Cent Hosp, Dept Surg Gastroenterol, Yamagata, Japan
[10] Tokyo Womens Med Univ, Inst Gastroenterol, Dept Surg, Tokyo, Japan
[11] Tochigi Canc Ctr, Dept Surg, Utsunomiya, Japan
[12] Nara Med Univ, Dept Surg, Kashihara, Japan
[13] Nara Med Univ, Div Endoscopy, Kashihara, Japan
[14] Osaka Rosai Hosp, Dept Surg, Sakai, Osaka, Japan
[15] Saitama Med Univ, Saitama Med Ctr, Dept Digest Tract & Gen Surg, Kawagoe, Saitama, Japan
[16] Osaka Int Canc Inst, Dept Surg Gastroenterol, Osaka, Japan
[17] Natl Ctr Global Hlth & Med, Dept Colorectal Surg, Tokyo, Japan
[18] Univ Tokyo Hosp, Dept Surg Oncol, Tokyo, Japan
[19] Teikyo Univ, Chiba Med Ctr, Ichihara, Chiba, Japan
[20] Kumamoto Univ, Grad Sch Med Sci, Dept Surg Gastroenterol, Kumamoto, Japan
[21] Kyoto Univ, Grad Sch Med, Dept Gastrointestinal Surg, Kyoto, Japan
[22] Kurashiki Cent Hosp, Dept Surg, Kurashiki, Okayama, Japan
[23] Teikyo Univ, Sch Med, Dept Surg, Tokyo, Japan
[24] Univ Fukui, Dept Surg 1, Fukui, Japan
[25] Mie Univ, Inst Life Sci, Dept Gastrointestinal & Pediat Surg, Div Reparat Med,Grad Sch Med, Tsu, Mie, Japan
[26] Hyogo Med Univ, Dept Surg Gastroenterol, Div Lower Gastrointestinal Surg, Nishinomiya, Hyogo, Japan
[27] Kyorin Univ, Sch Med, Dept Surg, Tokyo, Japan
[28] Kurume Univ, Sch Med, Dept Surg, Kurume, Fukuoka, Japan
[29] Kansai Med Univ, Dept Colorectal Surg, Osaka, Japan
[30] Hirosaki Univ, Grad Sch Med, Dept Gastroenterol Surg, Aomori, Japan
[31] Nagoya Univ, Grad Sch Med, Dept Gastroenterol Surg Surg 2, Nagoya, Japan
[32] Inst Sci Tokyo, Tokyo, Japan
[33] Niigata Univ, Grad Sch Med & Dent Sci, Div Mol & Diagnost Pathol, Niigata, Japan