1. Ministry of Health and Population, Cairo, Egypt;
2. Department of Community, Environmental and Occupational Medicine, Faculty of Medicine, Ain Shams University, Cairo, Egypt;
3. Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia;
4. Department of Microbiology, University of Georgia, Athens, Georgia;
5. National Nutrition Institute, General Organization for Teaching Hospitals and Institutes, Cairo, Egypt