Assessment of Risk of Bias
We assessed the risk of bias according to the following domains as suggested in the ROBINS-I tool for nonrandomized studies.13 1. Bias due to selection of participants in the study
2. Bias due to missing data
3. Bias in the measurement of outcomes
4. Bias in the selection of the reported result
We considered the domains for each study and then made a judgment of high or low risk of bias for the studies included in the meta-analysis.