Meta-Analysis
Copyright ©The Author(s) 2021.
World J Clin Cases. Jun 16, 2021; 9(17): 4210-4220
Published online Jun 16, 2021. doi: 10.12998/wjcc.v9.i17.4210
Figure 2
Figure 2 Risk of bias assessment. (+): Low; (?): Unclear; (-): High.