[1] Int Univ Hlth & Welf, Sanno Hosp, Dept Surg, Minato Ku, 8-10-16 Akasaka, Tokyo 1070052, Japan
[2] Kyushu Univ, Grad Sch Med Sci, Dept Surg & Sci, Higashi Ku, 3-1-1 Maidashi, Fukuoka, Fukuoka 8128582, Japan
[3] Shizuoka Canc Ctr, Div Gastr Surg, 1007 Shimonagakubo, Nagaizumi, Shizuoka 4118777, Japan
[4] Int Univ Hlth & Welf Hosp, Dept Gastroenterol Surg & Gen Surg, 537-3 Iguchi, Nasushiobara 3292763, Japan
[5] Univ Tokyo, Grad Sch Med, Dept Gastroenterol Surg, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
[6] Yokohama City Univ, Gastroenterol Ctr, Dept Surg, Minami Ku,Med Ctr, 4-57 Urafune, Yokohama, Kanagawa 2320024, Japan
[7] Sendai Open Hosp, Dept Gastroenterol Surg & Gen Surg, Miyagino Ku, 5-22-1 Tsurugaya, Sendai, Miyagi 9830824, Japan
[8] Teikyo Univ, Dept Surg, Sch Med, Itabashi Ku, 2-11-1 Kaga, Tokyo 1738606, Japan
[9] Osaka Univ, Grad Sch Med, Dept Gastroenterol Surg, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[10] Kagoshima Univ, Grad Sch Med & Dent Sci, Dept Digest Surg Breast & Thyroid Surg, 35-1 Sakuragaoka, Kagoshima 8908544, Japan
[11] Keiyukai Sapporo Hosp, Dept Gastroenterol Surg, Shiroishi Ku, Kital 1 Hondori 14 Cho Me, Sapporo, Hokkaido 0030027, Japan
[12] Kyushu Canc Ctr, Dept Gastroenterol Surg, Minami Ku, 3-1-1 Notame, Fukuoka, Fukuoka 8111395, Japan
[13] Hiroshima City Asa Citizens Hosp, Dept Surg, Kita Ku, 2-1-1 Kabeminami, Hiroshima 7310293, Japan
[14] Tokyo Metropolitan Tama Med Ctr, Dept Surg, 8-29 Musashidai, Fuchu, Tokyo 1838524, Japan
[15] Matsuyama Red Cross Hosp, Dept Surg, 1 Bunkyo Cho, Matsuyama, Ehime 7908524, Japan
[16] Hiroshima City Hiroshima Citizens Hosp, Dept Surg, Naka Ku, 33 Motomachi, Hiroshima 7308518, Japan
[17] Komagome Hosp, Tokyo Metropolitan Canc & Infect Dis Ctr, Dept Surg, Bunkyo Ku, 3-18-22 Honkomagome, Tokyo 1138677, Japan