1. Department of Cardiology Massachusetts General Hospital, Harvard Medical School Boston Massachusetts USA
2. Department of Internal Medicine King Edward Medical University Lahore Pakistan
3. Department of Internal Medicine Rawalpindi Medical University Lahore Pakistan
4. Department of Internal Medicine Mayo Clinic Rochester New York State USA
5. Department of Cardiology, Department of Medicine Detroit Medical Center Detroit Michigan USA
6. Department of Medicine, Division of Cardiology Loma Linda University Health Loma Linda California USA