1. Department of Neurology, XuanWu Hospital Capital Medical University Beijing China
2. Department of Neurology, The Second Affiliated Hospital Harbin Medical University Beijing China
3. Center for Evidence‐Based Medicine, Xuanwu Hospital Capital Medical University Beijing China
4. Department of Neurology, Department of General Surgery, China National Clinical Research Center for Geriatric Diseases, XuanWu Hospital Capital Medical University Beijing China