1. Department of Medicine, King Saud bin Abdulaziz University for Health Sciences , Riyadh, P.O. Box 3660 Postal code 11481 , Saudi Arabia
2. Division of Otolaryngology-Head and Neck Surgery , Department of Surgery, , Riyadh, P.O. Box 3660 Postal code 11481 , Saudi Arabia
3. King Abdulaziz Medical City, Ministry of National Guard Health Affairs , Department of Surgery, , Riyadh, P.O. Box 3660 Postal code 11481 , Saudi Arabia