Figure 4.
Absolute improvements in MCT (assessment of heterogeneity: spray, q = 0.4, df(Q) = 1, p < 0.542, I2 = 0.000, τ2 = 0.000; overall, q = 0.4, df(Q) = 1, p < 0.542, I2 = 0.000 τ2 = 0.000).
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