1. The Department of Radiotherapy, Tianjin Medical University Cancer Institute and Hospital; National Clinical Research Center for Cancer; Tianjin Key Laboratory of Cancer Prevention and Therapy; Tianjin's Clinical Research Center for Cancer, Tianjin, P.R. China.
2. The First Department of Medical Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.
3. The Third Department of Medical Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.
4. The Second Department of Medical Oncology, General Hospital of Ningxia Medical University, Yinchuan, P.R. China.