1. Center for Outcomes Research and Evaluation, Yale New Haven Hospital, New Haven, Connecticut
2. Richard and Susan Smith Center for Outcomes Research in Cardiology, Division of Cardiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
3. Department of Chronic Disease Epidemiology, Yale School of Public Health, New Haven, Connecticut
4. Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, Connecticut
5. Department of Health Policy and Management, Yale School of Public Health, New Haven, Connecticut