Fig. 3From: A systematic review and meta-analysis of haematological malignancies in residents living near petrochemical facilitiesMeta-regression outputs, illustrating the relationship between Relative Risk (RR) of leukaemia incidence and the initial reporting year of each study, while controlling for study quality. The contour-enhance funnel plot is used to check for the impact of unpublished literature, and the significance of individual studiesBack to article page