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Cochrane risk of bias
| Study |
Year of publication |
Random sequence generation |
Allocation concealment |
Binding of participants and personnel |
Blinding of outcome assessments |
Incomplete outcome data |
Selective reporting |
Other bias |
|---|---|---|---|---|---|---|---|---|
| Wu et al. [27] | 2012 | ? | ? | ? | ? | ? | - | - |
| Shehata et al. [28] | 2013 | - | - | - | ? | - | - | ? |
| Zúñiga et al. [29] | 2013 | ? | + | - | ? | ? | - | ? |
| Zhang et al. [30] | 2014 | - | - | - | ? | - | - | ? |
+ = low risk; ? = unclear risk; - = high risk.
