1. From the Cardiovascular Division, Department of Medicine, University of Minnesota Medical Center, Minneapolis (J.P.B., L.Y.C.)
2. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis (F.L.N., P.L.L.)
3. Department of Neurology, University of Mississippi Medical Center, Jackson (T.M.)
4. Department of Epidemiology and Prevention, Epidemiological Cardiology Research Center, Wake Forest University School of Medicine, Winston-Salem, NC (E.Z.S.)
5. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD (R.F.G.)
6. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA (A.A.).