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| Author, year | Bias arising from the randomization process | Bias due to deviations from the intended interventions | Bias due to missing outcome data | Bias in measurement of the outcome | Bias in selection of the reported result | Overall risk of bias |
| Sun, 2007 [13] | Low | Low | Low | Low | Low | Low |
| Connelly, 2008 [14] | Low | Low | Low | Low | Low | Low |
| Aisen, 2008 [15] | Low | Low | Low | Low | Low | Low |
| Chen, 2016 [16] | Low | Low | Low | Low | Low | Low |
| Chen, 2021 [17] | Low | Low | Some concerns | Low | Low | Some concerns |
