1. Department of Biological and Medical Research, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
2. Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
3. Department of Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
4. Department of Clinical Laboratory Sciences. College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia