1. From the Department of Neurology (S.Z., B.P., A.D., G.E., M.P.), Johns Hopkins University School of Medicine, Baltimore, MD; Cardiology (F.H.S.), MedStar Medical Group, Washington, DC; Division of Cardiology (J.V., D.J., E.B.), Johns Hopkins University School of Medicine, Baltimore, MD; and Department of Cardiology (D.J.), Medical University of South Carolina, Charleston.