Article Info Authors Dr.Heba Anwar AL-khamisDr.Abdul Jamil ChoudhryDr.Shady Abdulrahman Kamel Volume: 22 Year: 2015 Month: January Issue: 1-4 Pages: Reference: AL-khamis H., Choudhry A., Kamel S., .Saudi Epidemiology Bulletin. 2015;22(1-4):.