[1] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, 6-5-1 Kashiwan, Kashiwa, Chiba 277 8577, Japan
[2] Natl Canc Ctr, Exploratory Oncol Res & Clin Trial Ctr, Div Biomarker Discovery, Kashiwa, Japan
[3] Natl Canc Ctr, JCOG Data Ctr, Operat Off, Tokyo, Japan
[4] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[5] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Sunto, Shizuoka, Japan
[6] Kanagawa Canc Ctr, Dept Gastrointestinal Surg, Yokohama, Japan
[7] Kindai Univ, Dept Gastroenterol & Hepatol, Fac Med, Osaka, Japan
[8] Chiba Canc Ctr, Dept Hepatobiliary & Pancreat Surg, Chiba, Japan
[9] Aichi Canc Ctr Hosp, Dept Gastroenterol, Nagoya, Aichi, Japan
[10] Hokkaido Univ Hosp, Div Canc Ctr, Sapporo, Hokkaido, Japan
[11] NHO Osaka Natl Hosp, Dept Surg, Osaka, Japan
[12] Tochigi Canc Ctr, Dept Hepatobiliary Pancreat Surg, Utsunomiya, Tochigi, Japan
[13] Kyorin Univ, Fac Med, Dept Med Oncol, Tokyo, Japan
[14] Niigata Canc Ctr Hosp, Dept Digest Surg, Niigata, Japan
[15] Teine Keijinkai Hosp, Ctr Gastroenterol, Sapporo, Japan
[16] Saitama Canc Ctr, Dept Gastroenterol Surg, Saitama, Japan
[17] Kanazawa Univ, Dept Hepatobiliary Pancreat Surg & Transplantat, Kanazawa, Japan
[18] NHO Shikoku Canc Ctr, Dept Digest Surg, Matsuyama, Ehime, Japan
[19] Tokyo Womens Med Univ, Inst Gastroenterol, Dept Internal Med, Tokyo, Japan
[20] Yokohama City Univ, Med Ctr, Gastroenterol Ctr, Yokohama, Japan
[21] Yamaguchi Univ, Dept Gastroenterol Breast & Endocrine Surg, Grad Sch Med, Ube, Japan
[22] Natl Ctr Global Hlth & Med, Dept Gastroenterol, Tokyo, Japan
[23] NHO Kyushu Canc Ctr, Dept Hepatobiliary Pancreatol, Fukuoka, Japan
[24] Sapporo Kosei Gen Hosp, Dept Surg Pathol, Sapporo, Japan
[25] Jichi Med Univ, Dept Surg, Shimotsuke, Japan
[26] St Marianna Univ, Sch Med, Dept Clin Oncol, Kawasaki, Japan
[27] Hyogo Med Univ, Dept Gastroenterol Surg, Nishinomiya, Hyogo, Japan
[28] Natl Canc Ctr Hosp East, Dept Hepatobiliary Pancreat Surg, Kashiwa, Chiba, Japan
[29] Kanagawa Canc Ctr, Div Hepatobiliary & Pancreat Med Oncol, Yokohama, Kanagawa, Japan