1. Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
2. Department of Geriatrics, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
3. Core Laboratory for Clinical Medical Research, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
4. Department of Physiology, Capital Medical University, Beijing, China.
5. Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Beijing, China.
6. Department of Neurobiology, Beijing Xuanwu Hospital, Capital Medical University, Beijing, China.
7. Department of Neurology, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China.
8. China National Clinical Research Center for Neurological Diseases, Beijing, China.
9. Beijing Key Laboratory on Parkinson's Disease, Beijing, China.