1. Unaizah College of Medicine and Medical Sciences, Qassim University, Riyadh, Saudi Arabia
2. Cardiac Anesthesia, King Abdulaziz Medical City, Riyadh, Saudi Arabia
3. Consultant Anesthetist, Security Forces Hospital, Riyadh, Saudi Arabia
4. Anesthesia, College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia