1. Cardiology and Angiology Unit, Department of Clinical and Experimental Internal Medicine, Medical Research Institute, University of Alexandria, Egypt;
2. Department of Cardiology, Faculty of Medicine, University of Alexandria, Egypt;
3. Michigan State University, East Lansing, Michigan, USA;
4. Radiodiagnosis Department, Faculty of Medicine, University of Alexandria, Egypt;
5. Aswan Heart Centre (Magdi Yacoub Foundation), Aswan, Egypt;
6. Radiodiagnosis Department, Medical Research Institute, University of Alexandria, Egypt