[1] Ogaki Municipal Hosp, Dept Surg, Gifu, Japan
[2] Ogaki Municipal Hosp, Dept Gastroenterol, Gifu, Japan
[3] Hiroshima Univ, Inst Biomed & Hlth Sci, Dept Epidemiol Infect Dis Control & Prevent, Hiroshima, Japan
[4] Osaka City Univ, Grad Sch Med, Dept Hepatobiliary Pancreat Surg, Osaka, Japan
[5] Musashino Red Cross Hosp, Dept Gastroenterol, Tokyo, Japan
[6] Shinshu Univ, Sch Med, Dept Radiol, Matsumoto, Nagano, Japan
[7] Keio Univ, Dept Pathol, Sch Med, Tokyo, Japan
[8] Kurume Univ Hosp, Dept Clin Lab Med, Kurume, Fukuoka, Japan
[9] Univ Tokyo, Sch Publ Hlth, Dept Biostat, Tokyo, Japan
[10] Univ Tokyo, Grad Sch Med, Hepatobiliary Pancreat Surg Div, Dept Surg, Tokyo, Japan
[11] Kanazawa Univ, Adv Prevent Med Res Ctr, Kanazawa, Ishikawa, Japan
[12] Univ Tokyo, Sch Publ Hlth, Grad Sch Med, Dept Biostat, Tokyo, Japan
[13] Nihon Univ, Dept Digest Surg, Sch Med, Tokyo, Japan
[14] Natl Ctr Global Hlth & Med, Tokyo, Japan
[15] Kinki Univ, Dept Gastroenterol & Hepatol, Sch Med, Osaka, Japan