[1] Tokyo Womens Med Univ, Dept Surg, Inst Gastroenterol, Shinjuku Ku, 8-1,Kawada Cho, Tokyo 1628666, Japan
[2] Phramongkutklao Hosp, Dept Surg, Div HPB Surg, Bangkok 10400, Thailand
[3] Ariake Hosp, Inst Canc, Dept Surg Gastroenterol, Koto Ku, 3-8-31 Ariake, Tokyo 1358550, Japan
[4] Kobe Univ, Grad Sch Med, Div Gastrointestinal Surg, Dept Surg,Chuo Ku, 7-5-2 Kusunoki Cho, Kobe, Hyogo 6500017, Japan
[5] Osaka Univ, Grad Sch Med, Dept Surg Gastroenterol, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[6] Wakayama Med Univ, Sch Med, Dept Surg 2, 811-1 Kimiidera, Wakayama 6418510, Japan
[7] Univ Toyama, Acad Assembly, Dept Surg & Sci, Fac Med, 2630 Sugitani, Toyama 9300194, Japan
[8] Tokyo Med Univ, Dept Gastrointestinal & Pediat Surg, 6 Chome 1-1 Shinjuku, Shinjuku City, Tokyo 1608402, Japan
[9] Nagasaki Univ, Grad Sch Biomed Sci, Dept Surg, 1-14 Bunkyomachi, Nagasaki, Japan
[10] Univ Tokyo, Dept Gastrointestinal Surg, Grad Sch Med, Bunkyo Ku, 7-3-1,Hongo, Tokyo 1130033, Japan
[11] Nagoya Univ, Grad Sch Med, Dept Gastroenterol Surg Surg 2, Showa Ku, 65 Tsurumai Cho, Nagoya, Aichi 4668560, Japan
[12] Okayama Univ Hosp, Gastrointestinal Surg Ctr Innovat Clin Med, Kita Ku, 2-5-1 Shikata Cho, Okayama 7008558, Japan
[13] Yokohama City Univ, Dept Surg, Kanazawa Ward, 3 Chome 9 Fukuura, Yokohama, Kanagawa 2360004, Japan
[14] Nara Med Univ, Dept Surg, 840 Shijo Cho, Kashihara, Nara 6348521, Japan