1. R&D Department; Egyptian Company for Blood Transfusion Services (EgyBlood), VACSERA; Giza Egypt
2. Department of Epidemiology and Public Health; University of Maryland School of Medicine; Baltimore Maryland
3. Department of Hepatology; National Liver Institute, Menoufia University; Shebeen El-Kom Menoufia Egypt
4. Department of Biostatistics and Cancer Epidemiology; South Egypt Cancer Institute, Assiut University; Assiut Egypt
5. Department of Microbiology and Immunology; Faculty of Medicine, Minia University; Minia Egypt