1. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston (J.H.W.).
2. Saint Luke’s Mid America Heart Institute/UMKC, Kansas City, MO (K.F.K., S.V.A., J.A.S.).
3. Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora (F.A.M., V.K., P.P., J.M., P.M.H.).
4. Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston (T.G.F.).
5. Yale University School of Medicine, New Haven, CT (J.P.C.).
6. Washington University School of Medicine, St Louis, MO (A.P.A.).
7. Minneapolis Heart Institute, MN (S.M.B.).
8. Harbor-UCLA Medical Center, Torrance, CA (W.J.F.).