1. From the Cardiovascular and Cardiothoracic Divisions of Columbia University Medical Center (K.L., M.D., Y.N., D.M.), New York, NY; Intermountain Medical Center (J.L., A.G.K.), Salt Late City, Utah; Advocate Christ Medical Center (M.S.S., M.A.S.), Oak Lawn, Ill; Duke University Medical Center (C.A.M., J.G.R.), Durham, NC; and Georgetown University-Washington Hospital Center (L.W.M.), Washington, DC.