1. Department of Neurosurgery Beijing Tiantan Hospital Capital Medical University Tiantan Xili 6 Beijing Dongcheng Distract 100050 China
2. China National Clinical Research Center for Neurological Diseases Tiantan Xili 6 Beijing Dongcheng Distract 100050 China
3. Department of Neuroepidemiology Beijing Neurosurgical Institute Tiantan Xili 6 Beijing Dongcheng Distract 100050 China
4. Department of Neuropathology Beijing Neurosurgical Institute Tiantan Xili 6 Beijing Dongcheng Distract 100050 China