1. From the Departments of Neurology (K.C.J.) and Public Health Sciences (K.C.J., D.P.W., X.-Q.W.), University of Virginia, Charlottesville; the Department of Neurology (G.C.N.), Albert Einstein Medical Center, New York, NY; University Hospitals Leuven (V.T.), Leuven, Belgium; the Department of Neurology (S.S.), University of North Carolina at Chapel Hill; and the National Institute of Neurological Disorders and Stroke (S.W.), Bethesda, Md.