RT Journal Article SR Electronic T1 Creating a demand for bias analysis in epidemiological research JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 91 OP 91 DO 10.1136/jech.2008.082420 VO 63 IS 2 A1 Matthew P Fox YR 2009 UL http://jech.bmj.com/content/63/2/91.abstract AB