RT Journal Article SR Electronic T1 Correction JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 864 OP 864 DO 10.1136/jech.2008.080382corr1 VO 63 IS 10 YR 2009 UL http://jech.bmj.com/content/63/10/864.abstract AB