[1] Keio Univ, Sch Med, Dept Surg, Tokyo, Japan
[2] Hyogo Med Univ, Dept Gastroenterol Surg, Div Inflammatory Bowel Dis, Nishinomiya, Hyogo, Japan
[3] Fukuoka Univ, Dept Surg, Chikushi Hosp, Fukuoka, Japan
[4] Univ Tokyo, Dept Surg Oncol, Tokyo, Japan
[5] Hiroshima Univ Hosp, Dept Infect Dis, Hiroshima, Japan
[6] Osaka Metropolitan Univ, Grad Sch Med, Surg Med, Osaka, Japan
[7] Tohoku Univ, Sch Med, Dept Surg, Sendai, Miyagi, Japan
[8] Tokyo Womens Med Univ, Dept Surg, Div Inflammatory Bowel Dis Surg, Tokyo, Japan
[9] Japan Community Hlth Care Org, Tokyo Yamate Med Ctr, Tokyo, Japan
[10] Mie Univ, Grad Sch Med, Dept Gastrointestinal & Paediat Surg, Tokyo, Japan
[11] Osaka Univ, Grad Sch Med, Dept Gastrointestinal Surg, Osaka, Japan
[12] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Oncol, Fukuoka, Japan
[13] Takano Hosp, Coloproctol Ctr, Kumamoto, Japan
[14] Niigata Univ, Div Digest & Gen Surg, Niigata, Japan
[15] Toho Univ, Sakura Med Ctr, Dept Surg, Chiba, Japan
[16] Yokohama City Univ, Inflammatory Bowel Dis Ctr, Med Ctr, Yokohama, Kanagawa, Japan
[17] Tohoku Rosai Hosp, Inflammatory Bowel Dis Ctr, Sendai, Miyagi, Japan
[18] Kyoto Univ, Grad Sch Med, Dept Gastrointestinal Surg, Kyoto, Japan
[19] Tokyo Med & Dent Univ, Dept Gastrointestinal Surg, Tokyo, Japan
[20] Showa Univ, Northern Yokohama Hosp, Digest Dis Ctr, Yokohama, Kanagawa, Japan
[21] Osaka Med & Pharmaceut Univ, Canc Ctr, Osaka, Japan
[22] Kindai Univ, Fac Med, Dept Surg, Osaka, Japan
[23] Nara Med Univ, Dept Surg, Nara, Japan
[24] Natl Def Med Coll, Dept Surg, Saitama, Japan
[25] Japan Community Hlth Care Org, Yokkaichi Hazu Med Ctr, Yokaichi, Mie, Japan
[26] Tokai Univ, Dept Digest Syst Surg, Sch Med, Hiratsuka, Kanagawa, Japan
[27] Fujita Hlth Univ, Sch Med, Dept Surg, Toyoake, Aichi, Japan
[28] Sapporo Higashi Tokushukai Hosp, Inst Biomed Res, Sapporo, Hokkaido, Japan
[29] Urasoe Gen Hosp Okinawa, Ctr Gastroenterol, Dept Surg, Urasoe, Japan
[30] Aichi Canc Ctr Hosp, Dept Gastroenterol Surg, Nagoya, Aichi, Japan
[31] Kurume Univ, Dept Surg, Sch Med, Fukuoka, Japan
[32] Univ Tokyo, Inst Med Sci, Dept Surg, Tokyo, Japan
[33] Saitama Med Univ, Dept Gastrointestinal Surg, Int Med Ctr, Saitama, Japan
[34] Teikyo Univ, Sch Med, Dept Surg, Tokyo, Japan
[35] Osaka City Gen Hosp, Dept Gastroenterol Surg, Osaka, Japan
[36] Kurume Coloproctol Ctr, Fukuoka, Japan
[37] Nishinomiya Municipal Cent Hosp, Dept Surg, Nishinomiya, Hyogo, Japan
[38] Japanese Red Cross Med Ctr, Dept Coloproctol Surg, Tokyo, Japan
[39] Osaka Rosai Hosp, Dept Surg, Osaka, Japan
[40] Kyorin Univ, Dept Surg, Tokyo, Japan
[41] Natl Canc Ctr, Dept Colorectal Surg, Tokyo, Japan
[42] Tokyo Med Univ, Dept Gastrointestinal & Paediat Surg, Tokyo, Japan
[43] Nagoya Univ, Dept Surg, Div Surg Oncol, Grad Sch Med, Nagoya, Aichi, Japan
[44] Natl Ctr Global Hlth & Med, Dept Surg, Tokyo, Japan
[45] Yamagata Prefectural Cent Hosp, Dept Gastroenterol Surg, Yamagata, Japan
[46] Saitama Canc Ctr, Div Gastroenterol Surg, Saitama, Japan
[47] Nippon Med Sch, Dept Gastrointestinal & Hepatobiliary Pancreat Sur, Tokyo, Japan
[48] Univ Fukui, Fac Med Sci, Dept Surg 1, Fukui, Japan
[49] Niigata Univ, Grad Sch Med & Dent Sci, Div Mol & Diagnost Pathol, Niigata, Japan
[50] Tokyo Med & Dent Univ, Dept Surg, Tokyo, Japan