1. Department of Radiology (Kanel, Müller, Sanchez-Catasus, Koeppe, Frey, Bohnen) and Department of Neurology (Frey, Bohnen), University of Michigan, Ann Arbor; Neurology Service and Geriatric Research Education and Clinical Center, Veterans Administration Ann Arbor Healthcare System, Ann Arbor, Mich. (Bohnen); Morris K. Udall Center of Excellence for Parkinson’s Disease Research, University of Michigan, Ann Arbor (Kanel, Müller, Sanchez-Catasus, Bohnen); and Department of Neurology, University of Groningen...