1. Department of Cardiac Sciences, College of Medicine, King Khalid University Hospital, Riyadh, Saudi Arabia
2. Department of Community Medicine (Biostatistics), Faculty of Medicine, Kuwait University, Kuwait
3. Department of Medicine, Security Forces Hospital, Riyadh, Saudi Arabia
4. Saud AlBabtain Cardiac Center, Dammam, Saudi Arabia
5. King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
6. King Fahad General Hospital, Jeddah, Saudi Arabia
7. KingKhalid National Guard Hospital, Jeddah, Saudi Arabia
8. King Abdul Aziz University Hospital, Jeddah, Saudi Arabia