RT Journal Article SR Electronic T1 Prevalence of smoking and frequency of visits to primary health care clinics JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 687 OP 688 VO 26 IS 4 A1 Al-Qahtani, Dhafer A. A1 Abdalla, Osman M. A1 Imtiaz, Mohammed L. YR 2005 UL http://smj.org.sa/content/26/4/687.abstract AB