1. College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
2. Department of Otolaryngology, Head and Neck Surgery, Ohud Hospital, Madinah, Saudi Arabia
3. Department of Otolaryngology, Head and Neck Surgery, King Fahad Medical City, Riyadh, Saudi Arabia
4. Department of Otolaryngology Head and Neck Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia