Table 2 Risk of bias assessment by Cochrane Collaboration Risk of Bias tool (RoB-2)
Study, Year. | Randomization process | Deviations from intended interventions | Missing outcome data | Measurement of the outcome | Selection of the reported result | Overall risk of bias |
|---|---|---|---|---|---|---|
Fu et al. 2021 [34] | Low | Low | Low | Low | Low | Low |
Mirhosseini et al. 2019 [35] | Some concerns | Low | Low | Low | Low | Some concerns |
Chen et al. 2018 [36] | Low | Low | Low | Low | Low | Low |
Ye et al. 2017 [37] | Low | Low | Low | Low | Low | Low |
Ibrahim et al. 2017 [38] | Some concerns | Low | Low | Low | Low | Some concerns |
Liu et al. 2015 [39] | Some concerns | Low | Low | Low | Low | Some concerns |
Shehata et al. 2014 [40] | Low | Low | Low | Low | Low | Low |
Rahman et al. 2012 [41] | Some concerns | Low | Low | Low | Low | Some concerns |
Onbasili et al. 2007 [42] | Low | Low | Low | Low | Low | Low |