1. Department of Medical Parasitology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
2. Department of Medical Parasitology, Theodor Bilharz Research Institute, Cairo, Egypt
3. Department of Pathology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
4. Department of Internal Medicine, Gastroenterology & Hepatology Unit, Zagazig University, Zagazig, Egypt