RT Journal Article SR Electronic T1 Social class analysis. JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 275 OP 276 DO 10.1136/jech.39.3.275 VO 39 IS 3 YR 1985 UL http://jech.bmj.com/content/39/3/275.1.abstract AB