1. Department of Emergency Medicine, College of Medicine, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
2. Department of Critical Care, College of Medicine, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
3. Radiology and Medical Imaging, Neuroradiology, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia