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Figure 4: Begg's funnel plot and Egger's linear regression plot for detecting the publication bias through the recessive model. (a) Begg's funnel plot for the rs1800591 polymorphism; (b) Egger's linear regression plot for the rs1800591 polymorphism; (c) Begg's funnel plot for the rs3816873 polymorphism; (d) Egger's linear regression plot for the rs3816873 polymorphism 
