1. Cardiology Department, Faculty of Medicine, Alexandria University Hospital, Alexandria, Egypt
2. International Center for Organization and Marketing, Alexandria, Egypt
3. Cardiology Department, Faculty of Medicine Assiut University Hospital, Assiut Governorate, Egypt
4. Cardiology Department, Faculty of Medicine Ain Shams University Hospital, Heliopolis, Egypt
5. Cardiology Department, Nasser Institute, Cairo, Egypt
6. Cardiology Department, Faculty of Medicine, Zagazig University Hospital, Zagazig, Egypt
7. Cardiology Department, Faculty of Medicine, Banha University Hospital, Banha, Egypt
8. Cardiology Department, Faculty of Medicine, Kasr El Ainy Hospital, Kasr Al Ainy, Egypt
9. Cardiology Department, Wady El Nile Hospital, Zeitoun, Egypt
10. Cardiology Department, Military Hospital, Heliopolis, Cairo, Egypt
11. Cardiology Department, National Heart Institute, Heliopolis, Cairo, Egypt
12. Physiology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt