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Forest plots of the overall mean effect size for all studies examining the outcomes of (a) TNF−α, (b) interleukin (IL)−6, (c) IL−8, (d) IL−10, (e) interferon (IFN)−γ, (f) salivary immunoglobulin A (IgA), (g) IL−1β, (h) IL−2, (i) IL−4, and (j) C−reactive protein (CRP).
