1. Department of Neurology, Duke University, Durham, NC, USA
2. Department of Behavioral and Community Health Sciences, University of Pittsburgh, Pittsburgh, PA, USA
3. The Edmond J Safra Program in Parkinson’s disease, Toronto Western Hospital, University of Toronto, Toronto, Ontario, USA
4. Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
5. Tuck School of Business, Dartmouth College, Hanover, NH, USA
6. Michael J. Fox Foundation, New York, NY, USA
7. Department of Psychiatry, University of Pennsylvania, Philadelphia, PA, USA