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Meta-analysis of tear IFN-γ levels: (A) mean values and 95% CI of control subjects; (B) standardized mean difference (SMD) of DED patients vs. control subjects. ES = effect size; DED = dry eye disease; SS = Sjogren’s syndrome; non SS = non Sjogren’s syndrome; ATD = aqueous tear deficiency; MGD = meibomian gland dysfunction.
