1. Department of Clinical laboratory sciences, College of Applied Medical Sciences, Taif University, Taif, Saudi Arabia
2. Basic sciences, College of Applied Medical Sciences, Albaha University, Albaha, Saudi Arabia
3. Lecturer of Public Health and Community Medicine, Faculty of Medicine, Cairo University, Giza, Egypt
4. Departement of Public Health, College of Applied Medical Sciences, Albaha University, Albaha, Saudi Arabia