1. Endemic Medicine Department; Faculty of Medicine; Helwan University; Cairo Egypt
2. Internal Medicine Department; Al-Azhar University; Cairo Egypt
3. Community, Environmental, and Occupational Health Department; Faculty of Medicine; Ain Shams University; Cairo Egypt
4. Internal Medicine Department; Faculty of Medicine; Assiut University; Assiut Egypt
5. New Cairo Viral Hepatitis Treatment Unit; Cairo Egypt
6. Public Health and Community Medicine Department; Faculty of Medicine; Tanta University; Tanta Egypt
7. Endemic Medicine and Hepatogastroenterology Department; Faculty of Medicine; Cairo University; Cairo Egypt