Missing data management
If the data contained in the literature is incomplete, attempts were made to contact the corresponding authors to obtain the necessary data. When the secondary classification data in the study is incomplete or missing, we conduct sensitivity analysis to determine whether the study can be excluded. When the mean change of continuous data does not report the standard deviation (SD), but the 95% confidence interval (95% CI) or P value of both groups are reported at the same time, the data will be converted and included in the meta-analysis.