1. From the Department of Medicine, Faculty of Medicine, College of Medicine, King Saud University, Riyadh.
2. From the Faculty of Medicine, Department of Biochemistry, Faculty of Medicine, College of Medicine, King Saud University, Riyadh.
3. From the Faculty of Science, Department of Nuclear Medicine, Faculty of Medicine, College of Medicine, King Saud University, Riyadh.
4. From the Faculty of Medicine, Ministry of Health, Faculty of Medicine, College of Medicine, King Saud University, Riyadh.
5. From the Department of Community Medicine, Faculty of Medicine, College of Medicine, King Saud University, Riyadh.