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Study-specific and combined relative risks (RRs) and 95% confidence intervals (CIs) for colorectal adenoma according to FokI and BsmI polymorphisms in the additive model. Black circles indicate study-specific odds ratios; horizontal lines represent the 95% CIs. The area of the gray squares reflects the study-specific weights (inverse of the variance). The dashed line represents the combined RR and the diamond represents the 95% CI for the combined RR.
