1. Department of Cardiology, Faculty of Medicine; Alexandria University; Champillion Street, Azarita Alexandria Egypt
2. Kasr Al Ainy Hospital, Cairo University; Cairo Egypt
3. National Heart Institute; Imbaba Giza Egypt
4. International Cardiac Centre; Alexandria Egypt
5. Ismaileya Insurance Hospital; Ismaileya Egypt
6. Zagazig University; Zagazig Egypt
7. Menoufia University; Shibin El Kom Egypt
8. Dar Al Fouad Hospital; Cairo Egypt
9. Gamal Abdel Nasser Insurance Hospital; Alexandria Egypt
10. Ain Shams University; Cairo Egypt
11. Ras Eltin General Hospital; Alexandria Egypt
12. Beni Suef University; Beni Suef Egypt
13. El Menshawy General Hospital; Tanta Egypt
14. Port Fouad General Hospital; Port Fouad Egypt
15. Assiut University; Assiut Egypt
16. Tanta University; Tanta Egypt
17. Banha University; Banha Egypt
18. Students' University Hospital; Alexandria Egypt
19. Damanhour General Hospital; Damanhour Egypt