1. From the Departments of Neurology (D.S.K., J.G.-R.) and Radiology (K.K., C.R.J.), Mayo Clinic, Rochester, MN; Departments of Biostatistics (M.E.G., S.T.L.) and Medicine (B.G.W., T.H.M.), University of Mississippi Medical Center, Jackson, MS; Departments of Neurology (R.F.G., M.S.A.) and Epidemiology (A.R.S., A.L.C.S.), Johns Hopkins University, Baltimore, MD; and Division of Public Health Sciences, Department of Social Sciences and Health Policy, Wake Forest School of Medicine, Winston-Salem, NC (L...