Fig. 2

Risk of bias assessment tool: (a) risk of bias graph; (b) risk of bias summary. Across trials, information is either from trials at a low risk of bias (green), at an unclear risk of bias (yellow), or at a high risk of bias (red)
Risk of bias assessment tool: (a) risk of bias graph; (b) risk of bias summary. Across trials, information is either from trials at a low risk of bias (green), at an unclear risk of bias (yellow), or at a high risk of bias (red)