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. 2011 Oct 14;17(38):4321–4333. doi: 10.3748/wjg.v17.i38.4321

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Effect of lamivudine treatment starting time on interruption of mother-to-child transmission indicated by newborn hepatitis B surface antigen or hepatitis B virus DNA. Vertical line indicates no difference between compared treatments. Horizontal lines show 95% CIs. Squares indicate point estimates, and the size of the squares indicates the weight of each study in the meta-analysis. CI: Confidence interval; HBV: Hepatitis B virus; M-H random: Mantel-Haenszel random-effects model; RR: Risk ratio; HBsAg: Hepatitis B surface antigen.