1. Division of Cardiology, Department of Medicine, Vanderbilt University Medical Center , Nashville, Tennessee , USA
2. Division of Internal Medicine, Department of Medicine, Morehouse School of Medicine , Atlanta, Georgia , USA
3. Department of Medicine, Morehouse School of Medicine , Atlanta, Georgia , USA
4. Department of Medicine, Cardiovascular Research Institute, Morehouse School of Medicine , Atlanta, Georgia , USA
5. Department of Medicine, University of Mississippi Medical Center , Jackson, Mississippi , USA
6. Division of Cardiology, Department of Medicine, Emory University School of Medicine , Atlanta, Georgia , USA
7. Division of Cardiology, Department of Medicine, Johns Hopkins School of Medicine , Baltimore, Maryland , USA
8. Department of Medicine, Boston Medical Center, Boston University Chobanian & Avedisian School of Medicine , Boston, Massachusetts , USA
9. Department of Medicine, Boston University School of Public Health , Boston, Massachusetts , USA