1. Department of General Practice XuanWu Hospital of Capital Medical University Beijing China
2. Department of Geriatrics XuanWu Hospital of Capital Medical University Beijing China
3. Department of Neurology XuanWu Hospital of Capital Medical University Beijing China
4. Department of General Surgery XuanWu Hospital of Capital Medical University Beijing China
5. Radiological Sciences Division of Clinical Neuroscience Queen’s Medical Centre University of Nottingham Nottingham United Kingdom
6. National Clinical Research Center for Geriatric Disorders Beijing China
7. Center of Alzheimer’s Disease Beijing Institute for Brain Disorders Beijing China