1. 1Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.
2. 2Institute of Radiation Oncology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.
3. 3Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.
4. 4Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, Hubei, P.R. China.
5. 5Department of Biliary–Pancreatic Surgery, Affiliated Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.
6. 6Department of Oncology, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei, P.R. China.
7. 7Department of Clinical Oncology, Renmin Hospital of Wuhan University, Wuhan, Hubei, P.R. China.
8. 8Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, P.R. China.
9. 9Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.