Table 1 Risk of bias of included RCTs
Study | Random sequence generation | Allocation concealment | Blinding of participants | Blinding of personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other sources of bias |
|---|---|---|---|---|---|---|---|---|
Fallon 2008 | Low risk | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Unclear |
Anneleen Berende 2016 | Low risk | Unclear | Unclear | Unclear | Unclear | Low risk | Low risk | Unclear |
Kaplan 2003 | Low risk | Unclear | Low risk | Unclear | Unclear | Low risk | Low risk | Unclear |
aKrupp 2003 | Low risk | Low risk | Unclear | Unclear | Low risk | Low risk | Low risk | Unclear |