1. From the Cardiology Division and Gazes Cardiac Research Institute (M.K., M.N., M.R.Z., G.D., H.T., G.C., B.A.C.) and the Department of Comparative Medicine (M.M.S., G.K.), Medical University of South Carolina, Charleston, and the Ralph H. Johnson Department of Veterans Affairs (M.R.Z., G.C., B.A.C.), Charleston, SC.