[1] Natl Canc Ctr Hosp East, Dept Hepatobiliary Pancreat Surg, Kashiwa, Chiba, Japan
[2] Natl Canc Ctr Hosp East, Dept Hepatobiliary & Pancreat Oncol, Kashiwa, Chiba, Japan
[3] Natl Canc Ctr Hosp East, Div Hepatobiliary & Pancreat Surg, Kashiwa, Chiba, Japan