1. Oncology Center, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
2. Department of Neurosurgery, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510280, P.R. China
3. Department of Medical Oncology, Fujian Provincial Hospital, Fuzhou, Fujian 350001, P.R. China
4. Department of Pathology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
5. Department of Radiology, Division of Radiobiology, Ohio State University Wexner Medical Center, Columbus, OH 43210, USA