1. Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China
2. Department of Neurosurgery, Xuanwu Hospital of Capital Medical University, Beijing, China
3. Cerebrovascular Diseases Research Institute, Xuanwu Hospital of Capital Medical University, Beijing, China
4. Clinical Research Institute, Peking University, Beijing, China
5. Department of Emergency, Xuanwu Hospital of Capital Medical University, Beijing, China
6. Cooper Neurological Institute, Cooper University Hospital, Camden, NJ, USA