1. From the Section of Chronic Disease Epidemiology (J.H.L., E.W., N.B.A., S.B.J.), Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Conn; UHC University HealthSystem Consortium (J.D.), Oak Brook, Ill; and Department of Medicine (Neurology) (L.B.G.), Duke Stroke Center, Center for Clinical Health Policy Research, Duke University and Durham Veterans Affairs Medical Center, Durham, NC.