1. Department of Electron Microscopy; Theodor Bilharz Research Institute; Giza; Egypt
2. Department of Pathology; Theodor Bilharz Research Institute; Giza; Egypt
3. Department of Gastroenterology and Hepatology; Theodor Bilharz Research Institute; Giza; Egypt
4. Department of Hematology, Faculty of Medicine; Cairo University; Cairo; Egypt
5. Department of Tropical Medicine, Faculty of Medicine; Minia University; Minia; Egypt