1. Endemic Medicine and Hepatology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Endemic Medicine Department, Faculty of Medicine, Helwan University, Cairo, Egypt
3. Tropical Medicine and Gastroenterology Department, Aswan University, Aswan, Egypt
4. Internal Medicine Department, National Hepatology and Tropical Medicine Research Institute, Cairo, Egypt
5. Department of research development, Badr University, Cairo, Egypt