1. Department of Anesthesia, Tanta University, Tanta, Egypt;
2. Department of Physiology, Tanta University Faculty of Medicine, Tanta, Egypt;
3. Department of Tropical Medicine, Tanta University, Tanta, Egypt;
4. Department of Internal Medicine, Zagazig University Faculty of Human Medicine, Zagazig, Egypt;
5. Department of Tropical Medicine, Tanta University Faculty of Medicine, Tanta, Egypt