1. Departmentment of ENT, King Saud University, Alkharj, Saudi Arabia
2. College of Medicine, Prince Sattam bin Abdulaziz University, Alkharj, Saudi Arabia
3. Department of Otolaryngology Head and Neck Surgery, King Abdulaziz University Hospital, RIyadh, Saudi Arabia
4. Department of Otolaryngology Head and Neck Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
5. Department of Otolaryngology, College of Medicine, Asan Medical Center, Seoul, Korea