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Forest plots of the association between IL-18 − 137G/C polymorphism and chronic hepatitis C virus infections in recessive contrast model (CC versus CG + GG). OR = 2.007, 95% CI [1.441, 2.797], chi-squared = 0.57 (d.f. = 2) p = 0.751, I-squared = 0.0% z = 4.12, p = 0.000.
