1. Department of Neurology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania USA
2. Department of Psychiatry; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania USA
3. PD Research, Education and Clinical Center; Philadelphia Veterans Affairs Medical Center; Philadelphia Pennsylvania USA
4. Department of Psychiatry; Yale University School of Medicine; New Haven Connecticut USA
5. Avid Radiopharmaceuticals; Philadelphia Pennsylvania USA
6. Department of Biostatistics; University of Rochester School of Medicine; Rochester New York USA
7. The Institute for Neurodegenerative Disorders; New Haven Connecticut USA