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Forest plot of the association between A carriers (AA + AG) and hepatocellular carcinoma according to tumor necrosis factor (TNF)-α-308 polymorphism in 14 studies using random-effect model in an Asian population. AA + GA, AA, and GA genotypes of TNF-α-308 polymorphism; and GG, GG genotype of TNF-α-308 polymorphism. M-H = xxxxxxxx.
