1. Department of Endemic Medicine and Gastroenterology, Faculty of Medicine, Minia University, Minia, Egypt
2. Department of Endemic Medicine and Gastroenterology, Faculty of Medicine, Fayoum University, Fayoum, Egypt
3. Department of Hepatology and Endemic Medicine, Faculty of Medicine, Cairo University, Cairo, Egypt
4. Medical Research Division, National Research Centre, Giza, Egypt
5. Department of Endemic Medicine and Gastroenterology, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt