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Meta-analysis of the IR: (A) Forest plot of the IR. The width of the horizontal line represents the 95%CI of individual studies. The vertical dotted line represents the overall expected IR. The combined estimate of IR was 91 % (95%CI: 88%–94 %, I2 = 90.15 %). (B) Funnel plot to assess the publication bias effect on the IR. Each dot represents a separate study. The funnel plot revealed no apparent evidence of publication bias.
