Table 3 Cochrane Collaboration tool risk of bias assessment
Study | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Data integrity | Selective reporting | Other sources of bias | Risk of bias |
|---|---|---|---|---|---|---|---|---|
Mall et al. [17] | Low risk | Low risk | High risk | Low risk | High risk | Low risk | Low risk | High |
Goel et al. [16] | Unclear risk | Unclear risk | Unclear risk | Unclear risk | Low risk | Low risk | Low risk | Unclear |
Qin et al. [13] | Unclear risk | Unclear risk | Unclear risk | Unclear risk | Low risk | Low risk | Low risk | Unclear |