[1] Shizuoka Canc Ctr, Div Gastrointestinal Oncol, Shizuoka, Japan
[2] Natl Canc Ctr, Clin Oncol Grp, Ctr Data, Ctr Res Adm & Support, Tokyo 104, Japan
[3] Kyoto Prefectural Univ Med, Dept Radiol, Kyoto, Japan
[4] Natl Canc Ctr, Dept Radiat Oncol, Tokyo, Japan
[5] Natl Canc Ctr, Div Pathol & Clin Labs, Tokyo, Japan
[6] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Hepatobiliary & Pancreat Oncol, Osaka, Japan
[7] Kanagawa Canc Ctr, Div Hepatobiliary & Pancreat Oncol, Yokohama, Kanagawa 2410815, Japan
[8] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, Kashiwa, Chiba, Japan
[9] Yokohama City Univ, Gastroenterol Ctr, Med Ctr, Yokohama, Kanagawa 232, Japan
[10] Tokyo Womens Med Univ, Inst Gastroenterol, Tokyo, Japan
[11] Natl Canc Ctr, Dept Hepatobiliary & Pancreat Oncol, Tokyo, Japan
[12] Japanese Fdn Canc Res, Canc Inst Hosp, Hepatobiliary & Pancreat Div, Tokyo, Japan
[13] Kansai Med Univ, Hirakata Hosp, Dept Surg, Hirakata, Osaka, Japan
[14] Osaka Natl Hosp, Dept Hepatobiliary & Pancreat Surg, Osaka, Japan
[15] Kobe Univ, Dept Internal Med, Sch Med, Div Gastroenterol, Kobe, Hyogo 657, Japan
[16] Toyama Univ, Dept Gastroenterol & Hematol, Fac Med, Toyama 930, Japan
[17] Jichi Med Univ, Sch Med, Dept Surg, Shimotsuke, Japan
[18] Tokai Univ, Sch Med, Dept Gastroenterol & Hepatol, Isehara, Kanagawa 25911, Japan
[19] Kyorin Univ, Sch Med, Dept Med Oncol, Tokyo, Japan