[1] Osaka Univ, Grad Sch Med, Dept Gastroenterol Surg, Osaka, Japan
[2] Osaka Univ, Grad Sch Med, Dept Therapeut Inflammatory Bowel Dis, Osaka, Japan
[3] Osaka Univ, Grad Sch Med, Div Hlth Sci, Osaka, Japan
[4] Osaka Cent Hosp, Dept Surg, Osaka, Japan
[5] Hyogo Coll Med, Dept Inflammatory Bowel Dis Surg, Nishinomiya, Japan
[6] Fukuoka Univ, Dept Surg, Chikushi Hosp, Chikushino, Japan
[7] Tokyo Yamate Med Ctr, Dept Coloproctol, Tokyo, Japan
[8] Osaka City Univ, Grad Sch Med, Dept Surg, Osaka, Japan
[9] Tohoku Univ, Grad Sch Med, Dept Surg, Sendai, Japan
[10] Keio Univ, Dept Surg, Tokyo, Japan
[11] Coloproctol Ctr Takano Hosp, Dept Surg, Kumamoto, Japan
[12] Hiroshima Univ Hosp, Dept Infect Dis, Hiroshima, Japan
[13] Hiroshima Univ Hosp, Dept Endoscopy, Hiroshima, Japan
[14] Kyushu Univ, Dept Surg & Oncol, Fukuoka, Japan
[15] Mie Univ, Inst Life Sci, Grad Sch Med, Dept Gastrointestinal & Pediat Surg, Tsu, Japan
[16] Toho Univ, Sakura Med Ctr, Dept Surg, Chiba, Japan
[17] Natl Def Med Coll, Dept Surg, Tokorozawa, Japan
[18] Sapporo Higashi Tokushukai Hosp, Adv Surg Ctr, Sapporo, Japan
[19] Tokyo Womens Med Univ, Dept Surg, Div Inflammatory Bowel Dis Surg, Tokyo, Japan
[20] Yokohama City Univ, Med Ctr, Inflammatory Bowel Dis Ctr, Yokohama, Japan
[21] Kyoto Univ Hosp, Dept Surg, Kyoto, Japan
[22] Tokyo Med & Dent Univ, Dept Gastrointestinal Surg, Tokyo, Japan
[23] Tohoku Rosai Hosp, Dept Colorectal Surg, Sendai, Japan
[24] Nara Med Univ, Dept Surg, Kashihara, Japan
[25] Fujita Hlth Univ, Sch Med, Dept Surg, Toyoake, Japan
[26] Osaka City Gen Hosp, Dept Gastroenterol Surg, Osaka, Japan
[27] Kurume Coloproctol Ctr, Kurume, Japan
[28] Niigata Univ, Grad Sch Med & Dent Sci, Div Digest & Gen Surg, Niigata, Japan
[29] Yokkaichi Hazu Med Ctr, Inflammatory Bowel Dis Ctr, Yokaichi, Japan
[30] Urasoe Gen Hosp, Ctr Gastroenterol, Dept Surg, Urasoe, Japan
[31] Teikyo Univ, Sch Med, Dept Surg, Tokyo, Japan
[32] Osaka Med Coll, Dept Gen & Gastroenterol Surg, Takatsuki, Japan
[33] Kyorin Univ, Dept Surg, Tokyo, Japan
[34] Kurume Univ Hosp, Dept Surg, Kurume, Japan
[35] Tokyo Med Univ Hosp, Dept Surg, Tokyo, Japan
[36] Nagoya Univ Hosp, Dept Gastroenterol Surg, Nagoya, Japan
[37] Nippon Med Sch, Dept Digest Surg, Tokyo, Japan
[38] Japanese Red Cross Med Ctr, Dept Coloproctol Surg, Tokyo, Japan
[39] Univ Tokyo, Dept Surg Oncol, Tokyo, Japan
[40] Niigata Univ, Dept Pathol, Niigata, Japan
[41] Tokyo Med & Dent Univ, Tokyo, Japan