1. Cardiac Center, King Fahd Military Medical Complex, Dhahran, Saudi Arabia
2. Department of Public Health, College of Health Sciences, Qatar University, Doha, Qatar
3. Cardiac Department, Sulaiman Al Habib Hospital, Riyadh, Saudi Arabia
4. Cardiac Department, King Fahd Military Hospital, Jeddah, Saudi Arabia
5. Cardiac Sciences Department, College of Medicine, King Saud University-Medical City, Riyadh, Saudi Arabia