Study |
Year of publication |
Random sequence generation |
Allocation concealment |
Blinding of outcome assessment |
Incomplete outcome data |
Selective reporting |
Other sources of bias |
---|---|---|---|---|---|---|---|
Boynuegri et al. [21] | 2012 | ? | ? | ? | + | + | + |
Chung et al. [22] | 2006 | ? | ? | + | + | + | + |
Adibrad et al. [23] | 2009 | ? | ? | + | + | + | + |
Bouri et al. [24] | 2008 | + | ? | + | + | + | + |
Romanos et al. [25] | 2015 | ? | ? | + | + | + | + |
Souza et al. [26] | 2015 | + | + | + | + | + | + |
Kim et al. [31] | 2009 | ? | ? | ? | + | + | + |
Esper et al. [32] | 2012 | ? | ? | ? | + | + | + |
+ = low risk; ? = unclear risk; - = high risk. |