1. Department of Hematology, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
2. Department of Neurosurgery, Navy General Hospital, Beijing 100048, P.R. China
3. Duke Clinical Research Institute, Duke University, Durham, NC 27705, USA
4. Department of Otorhinolaryngology, Head and Neck Surgery, Nanjing Tongren Hospital, Southeast University, Nanjing 211100, P.R. China
5. Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China
6. Neuroimaging Center, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, P.R. China