[1] Teikyo Univ, Sch Med, Dept Surg, Itabashi Ku, Tokyo 1738605, Japan
[2] Tokyo Womens Med Univ, Dept Surg 2, Tokyo, Japan
[3] Natl Canc Ctr, Div Gastrointestinal Med Oncol, Tokyo, Japan
[4] Hiroshima Univ Hosp, Dept Endoscopy, Hiroshima, Japan
[5] Natl Canc Ctr, Dept Radiat Oncol, Tokyo, Japan
[6] Niigata Univ, Grad Sch Med & Dent Sci, Div Mol & Diagnost Pathol, Niigata, Japan
[7] Univ Tsukuba, Grad Sch Comprehens Human Sci, Div Gastroenterol, Ibaraki, Japan
[8] Canc Inst Ariake Hosp, Dept Endoscopy, Tokyo, Japan
[9] Saitama Med Univ, Saitama Med Ctr, Dept Digest Tract & Gen Surg, Saitama, Japan
[10] Tokyo Med & Dent Univ, Grad Sch, Dept Surg Oncol, Tokyo, Japan
[11] Aichi Canc Ctr, Dept Gastroenterol Surg, Nagoya, Aichi 464, Japan
[12] Univ Tokyo, Grad Sch Med, Artificial Organ & Transplantat Div, Hepatobiliary Pancreat Surg Div,Dept Surg, Tokyo, Japan
[13] Aichi Canc Ctr Hosp, Dept Clin Oncol, Nagoya, Aichi 464, Japan
[14] Natl Canc Ctr Hosp E, Res Ctr Innovat Oncol, Div Pathol, Chiba, Japan
[15] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Radiat Oncol, Tokyo, Japan
[16] Kyorin Univ, Sch Med, Dept Pathol, Tokyo, Japan
[17] Natl Canc Ctr, Endoscopy Div, Tokyo, Japan
[18] Kyoto Univ, Dept Surg, Kyoto, Japan
[19] Natl Def Med Coll, Dept Surg, Saitama, Japan
[20] Natl Canc Ctr Hosp E, Dept Gastroenterol & Gastrointestinal Oncol, Chiba, Japan
[21] Dokkyo Med Univ, Sch Med, Dept Surg & Mol Pathol, Tochgi, Japan
[22] Tohoku Univ, Grad Sch Med, Dept Hlth Adm & Policy, Sendai, Miyagi 980, Japan
[23] Aomori Prefectural Cent Hosp, Dept Surg, Ctr Canc, Aomori, Japan
[24] Misawa City Hosp, Dept Internal Med & Med Oncol, Misawa, Japan
[25] Komagome Hosp, Dept Surg, Tokyo Metropolitan Canc & Infect Dis Ctr, Tokyo, Japan
[26] Osaka Med Coll, Ctr Canc Chemotherapy, Osaka, Japan
[27] Kurume Univ, Sch Med, Div Gastrointestinal Endoscopy, Fukuoka, Japan
[28] Canc Inst Hosp, Dept Gastroenterol Surg, Tokyo, Japan
[29] Int Univ Hlth & Welf, Chemotherapy Res Inst, Dept Hemodialysis & Surg, Ichikawa, Japan
[30] Toho Univ, Med Ctr, Sakura Hosp, Chiba 2748510, Japan
[31] Tochigi Canc Ctr, Dept Surg, Utsunomiya, Tochigi, Japan