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Forest plot of the ORs and 95%CIs of studies on the association between HCC and MTHFR C677T polymorphism (TT vs. CT) when the CLD controls were compared with the HCC cases of four studies. The size of the black box corresponding to each study is proportional to the sample size. The horizontal line shows the corresponding 95%CI of the OR. The combined estimate is based on a fixed-effects model shown by the diamond.
