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 985 OP 985 DO 10.1136/jech.2008.079806corr1 VO 63 IS 12 YR 2009 UL http://jech.bmj.com/content/63/12/985.abstract AB