1. From Department of Epidemiology (M.J.R., R.S.V., R.M.), Michigan State University, East Lansing, Mich; Division of Cardiology (G.C.F.), University of California, Los Angeles, Calif; Duke Clinical Research Center (L.L., D.W.M.O.), Durham, NC; Department of Clinical Neurosciences (E.E.S.), University of Calgary, Calgary, Canada; Division of Neurology (L.H.S.), Massachusetts General Hospital, Boston, Mass.