[1] Juntendo Univ, Grad Sch Med, Dept Gastroenterol, Tokyo, Japan
[2] Hiroshima Univ Hosp, Grad Sch Biomed & Hlth Sci, Dept Gen Internal Med, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
[3] Natl Ctr Global Hlth & Med, Dept Surg, Tokyo, Japan
[4] Teikyo Univ, Sch Med, Dept Med, Tokyo, Japan
[5] Chiba Univ, Dept Med & Gastroenterol, Chiba, Japan
[6] Japanese Red Cross Nagoya Daini Hosp, Dept Gastroenterol, Nagoya, Aichi, Japan
[7] Kurashiki Cent Hosp, Dept Anat Pathol, Kurashiki, Okayama, Japan
[8] Univ Tokyo, Grad Sch Med, Dept Gastroenterol, Tokyo, Japan
[9] Univ Tokyo, Grad Sch Med, Dept Surg, Artificial Organ & Transplantat Div, Tokyo, Japan
[10] Hiroshima Univ, Inst Biomed & Hlth Sci, Dept Gastroenterol & Metab, Appl Life Sci, Hiroshima, Japan
[11] Nagoya City Univ, Grad Sch Med Sci, Dept Gastroenterol & Metab, Nagoya, Aichi, Japan
[12] Nagoya Univ Hosp, Dept Endoscopy, Nagoya, Aichi, Japan
[13] Niigata Univ, Grad Sch Med & Dent Sci, Div Digest & Gen Surg, Niigata, Japan
[14] Tokyo Med Univ, Dept Gastroenterol & Hepatol, Tokyo, Japan
[15] Nagoya Univ, Grad Sch Med, Dept Surg, Div Surg Oncol, Nagoya, Aichi, Japan
[16] Iida Municipal Hosp, Dept Gastroenterol, Nagano, Japan
[17] Tokyo Metropolitan Komagome Hosp, Dept Internal Med, Tokyo, Japan
[18] Nagoya Univ, Grad Sch Med, Dept Gastroenterol, Nagoya, Aichi, Japan
[19] Tohoku Univ, Grad Sch Med, Div Gastroenterol, Sendai, Miyagi, Japan
[20] Dokkyo Med Univ, Dept Surg 2, Mibu, Tochigi, Japan
[21] Matsusaka Cent Gen Hosp, Dept Surg, Matsusaka, Mie, Japan
[22] Tohoku Univ, Grad Sch Med, Dept Surg, Sendai, Miyagi, Japan