1. Division of Cardiology, University of Texas Southwestern Medical Center, Dallas
2. Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, New Haven, Connecticut
3. Division of Cardiology, Department of Internal Medicine, University of Michigan, Ann Arbor
4. Division of Cardiovascular Medicine, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City
5. Saint Luke's Mid America Heart and Vascular Institute, Kansas City, Missouri6University of Missouri-Kansas City, Kansas City, Missouri
6. Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, New Haven, Connecticut7Section of Cardiovascular Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, Connecticut8Department of Health Policy and Management, Yale School of Public Health, New Haven, Connecticut