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Begg’s method for investigating publication bias: (a) Begg’s funnel plot of the publication bias for studies about the effect of vitamin D supplementation on thyroid peroxidase antibody titre; (b) Begg’s funnel plot of the publication bias for studies about the effect of vitamin D supplementation on thyroglobulin antibody titre. SMD, standardized mean difference; s.e., standard error.7–14
