1. Duke Clinical Research Institute, Durham, NC (A.D.D., C.L.H., L.T., A.F.H.).
2. Department of Medicine, Duke University School of Medicine, Durham, NC (A.D.D., A.F.H.).
3. Novartis Pharmaceuticals Corporation, East Hanover, NJ (P.P.S., C.I.D., K.M.).
4. Cleveland Clinic, OH (N.M.A.).
5. University of Mississippi Medical Center, Jackson (J.B.).
6. Eshelman School of Pharmacy, University of North Carolina, Chapel Hill (J.H.P.).
7. Saint Luke’s Mid America Heart Institute and the University of Missouri-Kansas City (J.A.S.).
8. Mended Hearts, Huntsville, AL (F.B.W.).
9. Ahmanson-UCLA Cardiomyopathy Center, Ronald Reagan UCLA Medical Center (G.C.F.).