1. Department of Medicine; King Saud University; Riyadh Saudi Arabia
2. Department of Pathology; Alfaisal University; Riyadh Saudi Arabia
3. Department of Pathology; King Saud University; Riyadh Saudi Arabia
4. Critical Care Department; King Saud University; Riyadh Saudi Arabia
5. Department of Radiology; King Saud University; Riyadh Saudi Arabia
6. Department of Family and Community Medicine; King Saud University; Riyadh Saudi Arabia