1. Department of Otolaryngology-Head and Neck Surgery, King Saud University Medical City, Riyadh, Saudi Arabia
2. Department of Otolaryngology-Head and Neck Surgery, King Fahad Specialist Hospital-Dammam, Dammam, Saudi Arabia
3. Department of Otolaryngology-Head and Neck Surgery, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
4. Department of Otolaryngology, Head and Neck Surgery, Al-Hada Armed Forces Hospital, Taif, Saudi Arabia