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Forest plots of XPD Asp312Asn polymorphism and HCC risk in subgroup analysis by source of controls using a random-effects model (recessive model Asn/Asn vs Asp/Asn+Asp/Asp). Asn = asparagine amino acid, Asp = aspartic acid, HB = hospital-based studies, HCC = hepatocellular carcinoma, OR = odds ratio, PB = population-based studies, XPD = xeroderma pigmentosum group D.
