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A forest plot of the present meta-analysis on the incidence of unsolicited symptoms after administration of 2vHPV compared to placebo or hepatitis vaccine. a 2vHPV versus Placebo, b 2vHPV versus Hepatitis vaccine. Risk ratios (RRs) and 95% confidence intervals (CI) are shown. The analysis was performed using the Mantel-Haenszel method with random effects model. Abbreviations: HPV, human papillomavirus; 2vHPV, bivalent human papillomavirus
