1. Duke Clinical Research Institute, Durham, North Carolina
2. Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
3. Duke-Margolis Center for Health Policy, Duke University, Durham, North Carolina
4. Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, North Carolina
5. Department of Cardiovascular Medicine, Heart, Vascular and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio
6. Department of Cardiac Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
7. Cardiovascular Research Foundation, New York, New York
8. St Francis Hospital and Heart Center, Roslyn, New York