1. Department of Medicine, Duke University Medical Center, Durham, NC (H.B.H.).
2. Division of Cardiology, Ahmanson-UCLA Cardiomyopathy Center, University of California Los Angeles Medical Center (G.C.F.).
3. Division of Cardiology, Duke University Medical Center, Durham, NC (M.S.K., S.J.G.).
4. Department of Medicine (H.G.C.V.S.), McMaster University, Hamilton, ON, Canada.
5. Population Health Research Institute (H.G.C.V.S.), McMaster University, Hamilton, ON, Canada.
6. Emory University School of Medicine, Atlanta, GA (A.A.M.).
7. Saint Luke’s Mid America Heart Institute, University of Missouri-Kansas City (M.E.N.).
8. Department of Cardiology, Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA (M.M.K.).
9. Baylor Scott and White Research Institute, Dallas, TX (J.B.).
10. Department of Medicine, University of Mississippi, Jackson (J.B.).
11. Duke Clinical Research Institute, Durham, NC (S.J.G.).