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Forest plot for evaluating the association between promoter methylation in the eight tumor-suppressor genes (RASSF1, P16, TSHR, PTEN, NIS/SLC, DAPK, RARβ2, and CDH1) and thyroid cancer risk. For RASSF1 and NIS/SLC, subgroup analyses are also presented. The random-effect model was used for all analyses.
