1. College of Medicine, Imam Abdulrahman Bin Faisal University , Dammam , Saudi Arabia
2. Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, King Abdulaziz Medical City, Ministry of National Guard Health Affairs , Riyadh , Saudi Arabia
3. Department of Pathology and Laboratory Medicine, King Abdulaziz Medical City, Ministry of National Guard Health Affairs , Riyadh , Saudi Arabia