Table 1 Study quality of included RCT on the Cochrane risk-of-bias criteria
RCT | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
Deng et al. [21] | Low risk | Low risk | High risk | Unclear risk | Unclear risk | Low risk | Unclear risk |
Feng et al. [28] | Low risk | Low risk | Unclear risk | Low risk | Unclear risk | Low risk | Unclear risk |
Liu et al. [41] | Low risk | Low risk | Unclear risk | Low risk | Unclear risk | Low risk | Unclear risk |
Gao et al. [45] | Low risk | Low risk | High risk | Unclear risk | Unclear risk | Low risk | Unclear risk |