1. Saint Luke’s Mid America Heart Institute and University of Missouri-Kansas City, MO (S.V.A.).
2. Duke University, Durham, NC (P.M., S.V., A.M.V., A.S.K.).
3. University of Colorado School of Medicine, Aurora (J.D.C.).
4. Marcus Heart and Valve Center, Piedmont Heart Institute, Atlanta, GA (V.H.T.).
5. Baylor Scott and White Health, Plano, TX (M.J.M.).
6. St. Francis Hospital, Roslyn, NY (D.J.C.).
7. Cardiovascular Research Foundation, New York (D.J.C.).