Period Family of Clock Genes as Novel Predictors of Survival in Human Cancer: A Systematic Review and Meta-Analysis

Figure 5

Begg’s funnel plot of OS for publication bias. (a) Begg’s funnel plot for PER1 protein expression and OS (). (b) Begg’s funnel plot for PER2 protein expression and OS (). (c) Begg’s funnel plot for PER2 mRNA expression and OS (). (d) Begg’s funnel plot for PER3 protein expression and OS ().

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(d)