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Forest plots of the association between IL-18 − 137G/C polymorphisms and chronic hepatitis C virus infections in dominant contrast model (CG + CC versus GG). OR = 2.157, 95% CI [1.822, 2.553], chi-squared = 1.39 (d.f. = 2) p = 0.499, I-squared = 0.0%, z = 8.93, p = 0.000.
