1. Smith Center for Outcomes Research in Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
2. Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
3. Harvard Medical School, Boston, Massachusetts
4. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Boston
5. Center for Interventional Vascular Therapy, Columbia University Irving Medical Center, New York, New York
6. Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
7. Advanced Cardiac & Vascular Amputation Prevention Centers, Grand Rapids, Michigan