Statistical analysis was performed using Stata 15.1 software. Since all outcomes were continuous variables, weighted mean difference (WMD) and 95% confidence interval (CI) were used to present the results. The I2 test was used for the heterogeneity test. The random-effect model was used in all analyses regardless of the I2 value. The metaregression was adopted to explore the sources of heterogeneity. Further sensitivity analysis was conducted to assess whether the results of the meta-analysis were stable or not. P < 0.05 was considered to be statistically significant.

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