Figure 4

Funnel plot analysis to detect publication bias. Each point represents a separate study for the indicated association. A Funnel plot for recessive model Cys/Cys vs. Ser/Cys + Ser/Ser of OGG1 Ser326Cys polymorphism in the overall analysis (P = 0.560); B Funnel plot for recessive model Glu/Glu vs. Asp/Glu + Asp/Asp of APEX1 Asp148Glu polymorphism in overall analysis (P = 0.504).