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