From the Departments of Clinical Neurosciences, Psychiatry, Pediatrics, and Community Health Sciences (T.P.), University of Calgary (N.C.), Alberta, Canada; Department of Neurology (G.S.D.), Mayo Clinic, Jacksonville, FL; Department of Neurology (D.B.S.), University of Colorado School of Medicine, Aurora; Cleveland Clinic Lerner College of Medicine (A.R.-G.), Case Western Reserve University, OH; New West Physicians (N.L.), Golden, CO; Department of Neurology (M.J.A.), University of Florida College of Medicine, Gainesville; Department of Neurology, Amsterdam University Medical Centers (R.M.A.d.B.), University of Amsterdam, the Netherlands; Department of Neurology (E.R.), Pitié-Salpêtrière Hospital, Sorbonne University and the Assistance Publique-Hôpitaux de Paris, France; Department of Medicine (J.M.M.), University of Alberta, Edmonton, Canada; Department of Neurology (R.A.H.), University of South Florida, Tampa; James J. and Joan A. Gardner Family Center for Parkinson's Disease and Movement Disorders and Department of Neurology (A.J.E.), University of Cincinnati, OH; Christiana Care Neurology Specialists (J.P.M.), Newark, DE; Department of Neurology (J.A.G.), University of Kentucky, Lexington; Department of Pediatrics, McMaster University (L.B.), Hamilton, Ontario, Canada; Department of Biostatistics, Epidemiology, and Environmental Health Sciences (K.S.), Jiann-Ping Hsu College of Public Health, Georgia Southern University, Statesboro; University of Alabama at Birmingham (M.S.F.); Department of Neurological Sciences (D.A.H.), Rush University Medical Center, Chicago, IL; Shirley Ryan Ability Lab and Department of Physical Medicine and Rehabilitation (M.R.), Feinberg School of Medicine, Northwestern University, Chicago, IL; Michael J. Fox Foundation for Parkinson's Research (L.H., T.H.), New York, NY; American Academy of Neurology (M.D.O., H.S.), Minneapolis, MN; Department of Neurology (G.G.), University of Kansas, Kansas City; The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic (A.E.L.), Toronto Western Hospital and the University of Toronto, Canada.