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. 2009 Jun 9;101(1):149–159. doi: 10.1038/sj.bjc.6605112

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Copyright © 2009 Cancer Research UK

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Funnel plots. Funnel plots showing the relationship between the effect size of individual studies (hazard ratios for overall survival, horizontal axis) and the precision of the study estimate (standard error, vertical axis) for p53, EGFR and HER-2/neu.