[1] Hiroshima Univ, Grad Sch Biomed & Hlth Sci, Dept Gastroenterol & Transplant Surg, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
[2] Natl Def Med Coll, Dept Surg, Saitama, Japan
[3] Komagome Hosp, Tokyo Metropolitan Canc & Infect Dis Ctr, Dept Surg, Tokyo, Japan
[4] Mie Univ, Grad Sch Med, Dept Gastrointestinal & Pediat Surg, Tsu, Mie, Japan
[5] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Gastroenterol Surg, Gastroenterol Ctr, Tokyo, Japan
[6] Tokyo Metropolitan Hiroo Gen Hosp, Dept Surg, Tokyo, Japan
[7] Natl Canc Ctr, Div Colorectal Surg, Tokyo, Japan
[8] Showa Univ, Northern Yokohama Hosp, Digest Dis Ctr, Yokohama, Kanagawa, Japan
[9] Saitama Med Univ, Saitama Med Ctr, Dept Digest Tract & Gen Surg, Saitama, Japan
[10] Hyogo Coll Med, Dept Surg, Div Lower GI Surg, Nishinomiya, Hyogo, Japan
[11] Tokyo Med & Dent Univ, Tokyo, Japan
[12] Natl Hosp Org Kure Med Ctr, Inst Clin Res, Dept Surg, 3-1 Aoyama Cho, Kure, Hiroshima 7370023, Japan
[13] Chugoku Canc Ctr, 3-1 Aoyama Cho, Kure, Hiroshima 7370023, Japan