1. Endemic Medicine and Hepatogastroenterology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Pediatrics department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
3. Endemic Medicine Department, Faculty of Medicine, Helwan university, Cairo, Egypt
4. Department of Tropical Medicine & Infectious Diseases, Faculty of Medicine, Tanta University, Tanta, Egypt
5. Department of infectious and Endemic Diseases, Faculty of medicine, Suez Canal University, Ismailia, Egypt
6. Department of hepatology, gastroenterology and infectious diseases, Banha University, Banh, Egypt
7. Internal Medicine Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
8. Department of Hepatology, National Liver Institute, Menoufyia University, Menoufyia, Egypt