1. Emory Structural Heart and Valve Center, Emory University School of Medicine, Atlanta, GA (J.C.L., A.B.G., N.K., P.T.G., I.B., J.F.C., A.J., G.P., K.J.G., V.C.B.).
2. Cadiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland (J.M.K., T.R., R.J.L.).
3. Division of Cardiology, University of Washington Medical Center, Seattle (J.T., J.M.M.).