[1] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, 6-5-1 Kashiwanoha, Kashiwa, Chiba 2778577, Japan
[2] Kyoto Univ, Sch Publ Hlth, Dept Biostat, Kyoto, Japan
[3] Kanagawa Canc Ctr, Dept Hepatobiliary & Pancreat Med Oncol, Yokohama, Kanagawa, Japan
[4] Natl Ctr Global Hlth & Med Ctr Hosp, Dept Gastroenterol, Tokyo, Japan
[5] Aichi Canc Ctr Hosp, Dept Diagnost & Intervent Radiol, Nagoya, Aichi, Japan
[6] Osaka City Univ Hosp, Dept Hepatol, Osaka, Japan
[7] Kinki Univ, Sch Med, Dept Gastroenterol & Hepatol, Osaka, Japan
[8] Osaka Natl Hosp, Dept Hepatobiliary & Pancreat Surg, Osaka, Japan
[9] Kanazawa Univ Hosp, Dept Gastroenterol, Kanazawa, Ishikawa, Japan
[10] Natl Hosp Org Kyushu Canc Ctr, Dept Hepatobiliary Pancreatol, Fukuoka, Japan
[11] Saiseikai Utsunomiya Hosp, Dept Gastroenterol, Utsunomiya, Tochigi, Japan
[12] Sapporo Kosei Gen Hosp, Dept Gastroenterol, Sapporo, Hokkaido, Japan
[13] Kyoto Prefectural Univ Med, Dept Mol Gastroenterol & Hepatol, Kyoto, Japan
[14] Kyoto Univ Hosp, Inst Adv Clin & Translat Sci, Kyoto, Japan
[15] Shikoku Canc Ctr, Clin Res Ctr, Matsuyama, Ehime, Japan
[16] Kyorin Univ, Dept Med Oncol, Tokyo, Japan
[17] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan