RT Journal Article SR Electronic T1 CORRECTIONS JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 271 OP 271 DO 10.1136/jech.57.3.218corr1 VO 61 IS 3 YR 2007 UL http://jech.bmj.com/content/61/3/271.4.abstract AB