1. From the Divisions of Cardiovascular Medicine (D.T., S.R., V.T., S.W., Z.Z., N.L., R.K.M., A.S., A.A.K., N.C.) and Cardiothoracic Surgery (J.N.Y.), University of California, Davis; and Department of Veterans Affairs (A.A.K., N.C.), Northern California Health Care System, Mather.