RT Journal Article SR Electronic T1 Physical activity opportunities in low socioeconomic status neighbourhoods JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1021 OP 1021 DO 10.1136/jech.2009.091173 VO 63 IS 12 A1 R E Lee A1 S K Mama A1 J A Banda A1 L G Bryant A1 K P McAlexander YR 2009 UL http://jech.bmj.com/content/63/12/1021.abstract AB