Article Info Authors Dr.Abdullah Bashir Said Al ManjiDr.Mohamed Nageeb AbdallaDr.Sami Saeed Saeed AlMudarra Volume: 26 Year: 2019 Month: January Issue: 1-4 Pages: Reference: Manji AB., Abdalla M., AlMudarra S., .Saudi Epidemiology Bulletin. 2019;26(1-4):.