RT Journal Article SR Electronic T1 Child Health: The Screening Tests JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 174 OP 175 DO 10.1136/jech.44.2.174-c VO 44 IS 2 A1 J R Butler YR 1990 UL http://jech.bmj.com/content/44/2/174.4.abstract AB