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Forest plots of the association between IL-18 − 607C/A polymorphisms and chronic hepatitis C virus infections in an additive contrast model (A versus C). OR = 1.029, 95% CI [0.915, 1.158] chi-squared = 4.06 (d.f. = 3) p = 0.255, I-squared = 26.0%, z = 0.48, p = 0.634.
