Figure 4From: Association between Tumor necrosis factor-alpha gene polymorphisms and prostate cancer risk: a meta-analysisFunnel plot for the detection of the publication bias in this meta-analysis. a Funnel plot for contrast AA + AG vs. GG of TNF-α-308G/A polymorphism in overall analysis; b Funnel plot for contrast AA + AG vs. GG of TNF-α-238G/A polymorphism in overall analysis.Back to article page