1. Department of Medicine, Duke University Medical Center, Durham, NC (J.A.R., A.K., M.W.K., S.V.R).
2. Division of Cardiology, Duke Clinical Research Institute, Durham, NC (L.A.K., D.M.W.).
3. Division of Cardiology, University of Colorado School of Medicine, Aurora (C.N.H., J.C.M.).
4. Department of Medicine, Penn State University, Hershey, PA (I.C.G.).
5. Department of Medicine, Stanford University, CA (R.A.H.).
6. Department of Medicine, McMaster University, Hamilton, ON (S.S.J.).
7. Department of Medicine, Boston University, MA (A.K.J.).
8. Division of Cardiovascular Medicine, Warren Alpert Medical School of Brown University and Lifespan Cardiovascular Institute, Providence, RI (J.D.A.).