1. Division of Cardiology & Centre for Clinical Epidemiology Jewish General Hospital McGill University Montreal Quebec Canada
2. Duke Centre for Clinical Research Institute Durham NC
3. Divisions of Cardiology Duke University Medical Center Durham NC
4. Division of Cardiac Surgery University of Florida Jacksonville FL
5. Division of Cardiac Surgery The Heart Hospital Baylor Plano Plano TX
6. Cardiothoracic Surgery Reif Cardiovascular Institute, Doylestown Hospital Doylestown PA
7. Division of Cardiac Surgery University of Colorado Hospital Aurora CO
8. Divisions of Cardiac Surgery Duke University Medical Center Durham NC
9. Department of Surgery Massachusetts General Hospital Boston MA