1. Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
2. Department of Neurology, Peking University People's Hospital, Beijing, China
3. Clinical Research Center for Cerebrovascular Disease of Hunan Province, Central South University, Changsha, Hunan Province, China
4. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan Province, China