[1] Natl Canc Ctr Hosp East, Hepatobiliary & Pancreat Oncol Dept, Kashiwa, Chiba, Japan
[2] Kanazawa Univ, Gastroenterol, Kanazawa, Ishikawa, Japan
[3] Chiba Univ, Sch Med, Gastroenterol, Chiba, Japan
[4] Kindai Univ, Dept Gastroenterol & Hepatol, Fac Med, Osaka, Japan
[5] Aichi Canc Ctr Hosp, Dept Diagnost & Intervent Radiol, Nagoya, Aichi, Japan
[6] Kanagawa Canc Ctr, Dept Hepatobiliary & Pancreat Med Oncol, Yokohama, Kanagawa, Japan
[7] Musashino Red Cross Hosp, Dept Gastroenterol & Hepatol, Musashino, Tokyo, Japan
[8] Saitama Canc Ctr, Dept Gastroenterol, Saitama, Japan
[9] Natl Ctr Global Hlth & Med Ctr Hosp, Dept Gastroenterol, Tokyo, Japan
[10] Ehime Prefectural Cent Hosp, Gastroenterol Ctr, Matsuyama, Ehime, Japan
[11] Okayama City Hosp, Dept Gastroenterol, Okayama, Japan
[12] Hiroshima Univ, Dept Gastroenterol & Metab, Hiroshima, Japan
[13] Yokohama City Univ, Gastroenterol Ctr, Med Ctr, Yokohama, Kanagawa, Japan
[14] Kyoto Univ, Dept Biostat, Sch Publ Hlth, Kyoto, Japan
[15] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[16] Kyorin Univ, Dept Med Oncol, Mitaka, Tokyo, Japan