1. Clinical Pharmacology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
2. Anatomy and Embryology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
3. Medical Physiology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
4. Otolaryngology department, Faculty of Medicine, Menoufia University, Menoufia, Egypt