RT Journal Article SR Electronic T1 SHORT REVIEWS JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 406 OP 406 DO 10.1136/jech.43.4.406 VO 43 IS 4 YR 1989 UL http://jech.bmj.com/content/43/4/406.abstract AB