RT Journal Article SR Electronic T1 The historical specificity of early life car ownership as an indicator of socioeconomic position JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 277 OP 278 DO 10.1136/jech.57.4.277 VO 57 IS 4 A1 A Ellaway A1 S Macintyre A1 L McKay YR 2003 UL http://jech.bmj.com/content/57/4/277.abstract AB