1. From the Division of Cardiology (S.A.), University of Kansas School of Medicine, Wichita; the Division of Cardiology (J.L.A., S.D.R., V.V., R.W.A., D.G.H., A.A.Q.) and Department of Biochemistry (D.P.J.), Emory University School of Medicine, Atlanta, Ga; Christiana Health System (W.S.W.), Newark, Del; and the Centers for Disease Control and Prevention (W.C.H.), Atlanta, Ga.