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Forest plot comparing change in central corneal thickness of epi-on and epi-off CXL after 1-year follow-up (Chi2 = chi-square statistic; CI = confidence interval; CXL = corneal crosslinking; df = degrees of freedom; epi-off = epithelium-off; epi-on = epithelium-on; IV = inverse variance; I2 = I-square heterogeneity statistic; Z = Z statistic).
