1. Baylor College of Medicine, Houston, Texas
2. Division of Cardiology, McAllister Heart Institute, University of North Carolina at Chapel Hill
3. Cedar Sinai Heart Institute, Los Angeles, California
4. Cardiology Division, Department of Medicine, Ronald Reagan Medical Center, University of California, Los Angeles in Westwood
5. Minneapolis Heart Institute Foundation at Abbott Northwestern Hospital, Minneapolis, Minnesota
6. Boston Medical Center, Boston, Massachusetts
7. San Diego Cardiac Center, Sharp Memorial Hospital, San Diego, California
8. Piedmont Heart Institute, Atlanta, Georgia
9. Pauley Heart Center, Virginia Commonwealth University, Richmond