1. Department of Community, Environmental and Occupational Medicine, Faculty of Medicine Zagazig University-Egypt;
2. College of Medicine, Taibah University, Saudi Arabia
3. Department of Public Health and Community Medicine, Faculty of Medicine, Al-Azhar University, New Damietta, Egypt
4. Anatomy and Embryology Department, Faculty of Medicine, Ain Shams University, Egypt
5. Medical Biochemistry and Molecular Biology, Faculty of Medicine, Zagazig University, Egypt
6. Medical Education Department, Suez Canal University, Ismailia City, Egypt