1. Anesthesia and Intensive Care Department, Faculty of Medicine, Assiut University, Assiut, Egypt
2. Lecturer of Otorhinolaryngology Head and Neck Surgery, Faculty of Medicine, Assiut University, Assiut, Egypt
3. Assistant Professor of Medical Physiology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
4. Medical Physiology Department, Sphinx University, New Assiut, Assiut, Egypt