1. From the Department of Biostatistics (G.H.), School of Public Health, University of Alabama at Birmingham, Birmingham, Ala; the Deep South Center on Effectiveness at the Birmingham VA Medical Center and the Division of Preventive Medicine (M.M.S.), University of Alabama at Birmingham, Birmingham, Ala; the Mayo Clinic (J.F.M.), Jacksonville, Fla; the National Institute of Neurological Disorders and Stroke, National Institutes of Health (C.S.M.), Bethesda, Md; the Department of Epidemiology (V.J.H., L...