1. Immunology Unit, Department of Pathology, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
2. Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
3. Medical Education Department, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
4. College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia
5. Department of Pathology, College of Medicine, King Saud University, Riyadh 11461, Saudi Arabia