Article Info Authors Dr.Salem Hamed Saif Al-BusaidiProf.Ashry Gad MohammedDr.Abdullah Gainan Alzahrani Volume: 19 Year: 2012 Month: July Issue: 3 Pages: Reference: Al-Busaidi S., Mohammed A., Alzahrani AG., .Saudi Epidemiology Bulletin. 2012;19(3):.