[1] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Canc Survey & Gastrointestinal Oncol, Osaka, Japan
[2] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Hepatobiliary Pancreat Oncol, Osaka, Japan
[3] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Surg, Osaka, Japan
[4] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Radiat Therapy, Osaka, Japan