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Forest plot of comparison of RCTs: CRR in CIN patients receiving PDT vs. patients receiving placebo. We used RevMan V5.3 for data processing. The data were analyzed by using the Mantel–Haenszel method and random effects model and presented as odds ratio (OR) with 95% confidence interval (CI). I2 = 0 implies that there was no heterogeneity, P < .05 indicates statistical significance.
