1. Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China
2. Department of Neurosurgery, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, P.R. China
3. Department of State Key Laboratory of Molecular Oncology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, P.R. China