1. Department of Surgery, College of Medicine, Majmaah University, Ministry of Education, Al-Majmaah City 11952, P.O. Box 66 Riyadh, Saudi Arabia
2. Otolaryngology Department, College of Medicine, Majmaah University, Ministry of Education, Al-Majmaah City 11952, P.O. Box 66 Riyadh, Saudi Arabia
3. Department of Public Health, College of Health Sciences, Saudi Electronic University, Riyadh 11673, Saudi Arabia
4. Department of Haematology, Faculty of Medical Laboratory Sciences, University of El Imam El Mahdi, Kosti 1158, Sudan