1. Department of Cardiac Sciences, King Fahad Cardiac Center, College of Medicine, King Saud University, Riyadh, Saudi Arabia
2. Prince Salman Heart Center, King Fahd Medical City, Riyadh, Saudi Arabia
3. Cardiology Department, Tanta University, Tanta, Egypt
4. King Abdulaziz University Hospital, Jeddah, Saudi Arabia
5. Prince Sultan Cardiac Center, Riyadh, Saudi Arabia
6. King Faisal Cardiac Center, King Faisal Specialist Hospital, Riyadh, Saudi Arabia
7. Madina Cardiac Center, Al Madina Al Monaoarah, Saudi Arabia
8. Prince Sultan Cardiac Center, Hafouf, Saudi Arabia
9. Faculty of Medicine, Health Sciences Centre, Kuwait University, Kuwait city, Kuwait