1 Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No. 6, Tiantan Xili, Dongcheng District, Beijing 100050, China; China National Clinical Research Center for Neurological Diseases, Beijing 100050, China.
2 Department of Neuropathology, Beijing Neurosurgical Institute, Capital Medical University, No. 6, Tiantan Xili, Dongcheng District, Beijing 100050, China.