1. Public Health and Community Medicine Department, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Endemic Medicine Department, Faculty of Medicine, Cairo University, Cairo, Egypt
3. Kasr Al Ainy Viral Hepatitis Center, Cairo University, Cairo, Egypt
4. Tropical Medicine Department, Faculty of Medicine, AinShams University, Cairo, Egypt
5. Tropical Medicine and Infectious Diseases Department, Faculty of Medicine, Zagazig University, Cairo, Egypt
6. Hepato-Gastroenterology and Infectious Diseases Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
7. Infectious Diseases Department, Armed Forces College of Medicine, Cairo, Egypt