RT Journal Article SR Electronic T1 When do we know enough to recommend action? The need to be bold but not reckless JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 931 OP 931 VO 61 IS 11 A1 Braveman, Paula YR 2007 UL http://jech.bmj.com/content/61/11/931.abstract AB