1. Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
2. National Clinical Research Center for Geriatric Disorders, Capital Medical University, Beijing, China
3. Department of Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
4. Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
5. Banner Alzheimer’s Institute Phoenix, AZ, USA