Article Info AuthorsDr.Nagham Khalid AbdulMatloupDr.Abdul Jamil ChoudhryDr.Mohammed AbdulAziz Al-MazroaVolume: 19Year: 2012Month: AprilIssue: 2Reference: AbdulMatloup N., Choudhry A., Al-Mazroa M., .Saudi Epidemiology Bulletin. 2012;19(2):.