1. Department of Neurobiology Xuanwu Hospital of Capital Medical University Beijing China
2. Department of Neurology Xuanwu Hospital of Capital Medical University Beijing China
3. Clinical and Research Center for Parkinson's Disease, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, Beijing Key Laboratory for Parkinson's Disease, Parkinson Disease Center of Beijing Institute for Brain Disorders, Advanced Innovation Center for Human Brain Protection, National Clinical Research Center for Geriatric Disorders Xuanwu Hospital of Capital Medical University Beijing China
4. Department of Nuclear Medicine Xuanwu Hospital of Capital Medical University Beijing China
5. Department of Geriatrics Xuanwu Hospital of Capital Medical University Beijing China
6. Montreal Neurological Institute and Hospital, Department of Neurology & Neurosurgery McGill University Montreal Canada