1. Department of Otorhinolaryngology–Head and Neck Surgery Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
2. Phoniatric Unit, Department of Otorhinolaryngology–Head and Neck Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt
3. resident, Department of Otorhinolaryngology, Al-Ahrar General Hospital, Zagazig, Egypt