1. Duke Clinical Research Institute (D.N.H., J.P.P., E.C.O., E.D.P., L.T.), Durham, NC.
2. Duke University Medical Center (J.P.P., E.D.P.), Durham, NC.
3. University of Colorado School of Medicine, Aurora (L.A.A.).
4. Ahmanson-UCLA Cardiomyopathy Center, Los Angeles, CA (G.C.F.).
5. Mayo Clinic College of Medicine, Rochester, MN (B.J.G.).
6. Lankenau Hospital and Medical Research Center, Philadelphia, PA (P.R.K.).
7. Columbia University Medical Center, New York, NY (J.A.R.).
8. Penn State Hershey Medical Center, Hershey, PA (G.V.N.).
9. Sidney Kimmel Medical College at Thomas Jefferson University, Lankenau Medical Center, Bryn Mawr Hospital, PA (M.D.E.).
10. Saint Luke’s Mid America Heart Institute/UMKC, Kansas City, MO (P.S.C., J.A.S.).
11. Division of General Internal Medicine, Massachusetts General Hospital (D.E.S.).
12. Duke University School of Medicine (L.T.), Durham, NC.