1. Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA
2. Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
4. Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
5. Department of Neurology, University Medical Center Goettingen, Goettingen, Germany
6. Paracelsus-Elena Klinik, Kassel, Germany
7. Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
8. Department of Neurology, University of California, San Diego, CA, USA
9. The Michael J. Fox Foundation for Parkinson’s Research, New York, NY, USA
10. Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
11. Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, SanFrancisco, CA, USA
12. Parkinson’s Disease Research, Education and Clinical Center, San Francisco Veterans Affairs Medical Center, San Francisco, CA, USA
13. Departmentof Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
14. Parkinson’s Disease Research, Education and Clinical Center, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA, USA
15. University of Rochester Medical Center, University of Rochester, Rochester, NY, USA.
16. Institute for Neurodegenerative Disorders, New Haven, CT, USA