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Begg's funnel plots of the Vitamin D receptor polymorphisms and chronic periodontitis susceptibility for publication bias test. (a) BsmI (allele model: A vs. G); (b) TaqI (heterozygote model: CT vs. TT); (c) FokI (dominant model: TT + TC vs. CC); and (d) ApaI (recessive model: TT vs. TG + GG).
