1. Emory Structural Heart and Valve Center, Emory University, Atlanta, GA (A.B.G., G.S.H., P.T.G., E.K.I., R.A.G., G.P., V.C.B.).
2. Cardiovascular Branch, Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (J.M.K., C.G.B., T.R., R.J.L.).
3. Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University, Atlanta (K.K.).