1. Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
2. Department of Neurology, University of Washington School of Medicine, Seattle, WA, USA
3. Lou Ruvo Center for Brain Health, Cleveland Clinic, Cleveland, OH, USA
4. Booth Gardner Parkinson’s Care Center, EvergreenHealth Medical Center, Kirkland, WA, USA
5. Virginia Mason Medical Center, Seattle, WA, USA