1. Institute of Public Health and Clinical Medicine, Umea University, 90187 Umea, Sweden
2. International Cardiac Centre, Alexandria 21526, Egypt
3. Clinic of Cardiology, University Clinical Centre of Kosovo, 10000 Prishtina, Kosovo
4. Cardiology Department, Faculty of Medicine, Alexandria University, Alexandria 21500, Egypt
5. Molecular and Clinic Research Institute, St. George University, London SW17 0QT, UK