RT Journal Article SR Electronic T1 Frequency, incidence, and prevalence JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 329 OP 329 DO 10.15537/smj.2016.3.14677 VO 37 IS 3 A1 Dastgiri, Saeed YR 2016 UL http://smj.org.sa/content/37/3/329.abstract AB