1. From the Department of Biostatistics (G.H., D.L.L., S.E.J.) and Department of Epidemiology (V.J.H.), School of Public Health, University of Alabama at Birmingham; Department of Neurology, University of Cincinnati, OH (D.O.K., A.J.); Department of Medicine, University of Vermont, Burlington (M.C.); and College of Community Health Sciences, University of Alabama, Tuscaloosa (J.C.H.).