Article Info AuthorsDr.Fahad Suliman Al-JasserDr.Abdullah Gainan AlzahraniDr.Ibrahim Ali KabbashVolume: 18Year: 2011Month: OctoberIssue: 4Reference: Al-Jasser F., Alzahrani AG., Kabbash I., .Saudi Epidemiology Bulletin. 2011;18(4):.