1. Department of Internal Medicine Dow University of Health Sciences Karachi Pakistan
2. Department of Medicine University of Mississippi Medical Center Jackson Mississipi USA
3. Division of Cardiology McMaster University Hamilton Canada
4. Population Health Research Institute Hamilton Canada
5. Division of Cardiology Duke University School of Medicine Durham North Carolina USA
6. Duke Clinical Research Institute Durham North Carolina USA
7. Division of Cardiology, Department of Internal Medicine, UT Southwestern Medical Center Dallas Texas USA
8. Baylor Scott and White Research Institute Dallas Texas USA