1. Cardiovascular Division, University of Pennsylvania, Philadelphia
2. Department of Medicine, Laval University, Quebec City, Quebec, Canada
3. Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio
4. Department of Medicine, Emory University, Atlanta, Georgia
5. Department of Surgery, Emory University, Atlanta, Georgia
6. Division of Cardiothoracic Surgery, University of Pennsylvania, Philadelphia
7. Department of Medicine, Columbia University Medical Center, New York, New York
8. Division of Cardiac Surgery, New York University Langone Medical Center, New York
9. Department of Cardiothoracic Surgery, Stanford University, Stanford, California
10. Department of Medicine, Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina