1. Section of Health Policy and Equity, Richard A. and Susan F. Smith Center for Outcomes Research, Beth Israel Deaconess Medical Center, Boston, Massachusetts
2. Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
3. Harvard Medical School, Boston, Massachusetts
4. Cardiovascular Division, Department of Medicine, Washington University School of Medicine, St Louis, Missouri
5. Center for Advancing Health Services, Policy & Economics Research, Washington University, St Louis, Missouri
6. Department of Health Policy and Management, Harvard School of Public Health, Boston, Massachusetts