1. Department of Occupational and Environmental Medicine, Faculty of Medicine, Cairo University, Egypt
2. Department of Clinical and Chemical Pathology, Faculty of Medicine, Cairo University, Egypt
3. Department of Community, Environmental and Occupational Medicine, Faculty of Medicine, Zagazig University, Egypt
4. Department of Health Sciences, Faculty of Health and Rehabilitation Sciences, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia