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Publication bias assessment. Bias indicators: Begg‐Mazumdar: Kendall's τ=0.32381, P (1 tailed)=0.046, P (2 tailed)=0.092; Egger: intercept=1.31 (95% confidence interval, 0.62–2.01), P (1 tailed) <0.001, P (2 tailed)=0.001. MH indicates Mantel‐Haenszel.
