1. Alhyatt Heart and Vascular Center Alexandria Egypt
2. Department of Cardiology Faculty of Medicine Tanta University Hospital Tanta Egypt
3. Department of Physiology Faculty of Medicine University of Alexandria Alexandria Egypt
4. Institute of Cardiovascular Physiology University Medical Center Goettingen Goettingen Germany
5. Department of Cardiology and Kolling Institute Royal North Shore Hospital St Leonards NSW Australia
6. Faculty of Medicine and Health Sciences Macquarie University Sydney NSW Australia