1. Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Division of Cardiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
2. Division of Cardiovascular Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia
3. The Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
4. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
5. Cardiovascular Division, Department of Medicine, Washington University School of Medicine in St Louis, St Louis, Missouri
6. Center for Health Economics and Policy, Institute for Public Health at Washington University, St Louis, Missouri