1. Departments of Psychiatry and Neurology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia; Pennsylvania; USA; Philadelphia Veterans Affairs Medical Center; Philadelphia Pennsylvania USA
2. Feinberg School of Medicine; Northwestern University; Chicago Illinois USA
3. Department of Biostatistics; College of Public Health; University of Iowa; Iowa City Iowa USA
4. Institute for Neurodegenerative Disorders (IND) and Molecular NeuroImaging; LLC (MNI); New Haven Connecticut USA
5. Avid Radiopharmaceuticals; Philadelphia Pennsylvania USA
6. Department of Neurobiology; Care Sciences and Society and the Alzheimer Disease Research Centre; Karolinska Institutet; Stockholm; Sweden; Centre for Age-Related Medicine; Stavanger University Hospital; Stavanger Norway
7. Neurodegenerative Diseases Centre; Neuroscience Section; Department of Medicine; University of Salerno; Italy
8. Institute for Ageing and Health; Newcastle University; Newcastle England
9. Department of Neurology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania USA
10. Michael J. Fox Foundation for Parkinson's Research; New York New York USA
11. Department of Neurology; University of Cincinnati Academic Health Center; Cincinnati Ohio USA
12. Lou Ruvo Center for Brain Health; Cleveland Clinic; Cleveland Ohio USA
13. UCSD Movement Disorder Center; Department of Neurosciences; University of California San Diego; San Diego California USA
14. Departments of Neurology and Psychiatry; University of Rochester School of Medicine and Dentistry; Rochester New York USA
15. Medivation; Inc.; San Francisco California USA
16. Department of Psychiatry; Yale School of Medicine; New Haven Connecticut USA