1. Cerebrovascular Diseases Research Institute and Department of Neurology; Xuanwu Hospital of Capital Medical University; Beijing China
2. Beijing Geriatric Medical Research Center; Beijing China
3. Key Laboratory of Neurodegenerative Diseases of Ministry of Education and Beijing Key Laboratory of Translational Medicine for Cerebrovascular Diseases; Beijing China
4. Department of Neurology; First Affiliated Hospital of Liaoning Medical University; Jinzhou China