Affiliation: | 1. Key Laboratory of Radiopharmaceuticals (Beijing Normal University), Ministry of Education, Beijing, 100875, P. R. China;2. Department of Radiology, University of Pennsylvania, Philadelphia, PA 19014, USA;3. Department of Pharmacology, University of Pennsylvania, Philadelphia, PA 19014, USA;4. Department of Neurology, Beijing Xuanwu Hospital, Capital Medical University, Beijing, China |