1. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Radiation Oncology, Peking University Cancer Hospital, Beijing Cancer Hospital and Institute, Beijing, P.R. China
2. Department of Oncology and Hematology, Chongqing the Third Hospital, Chongqing, P.R. China
3. The First Clinical Medical College, Nanchang University, Nanchang, P.R. China
4. Department of Radiation Oncology, Beijing Tisinghua Changgung Hospital, Medical Center, Tisinghua University, Beijing, P.R. China.