Risk of bias

Indiectedness

Inconsistency

Imprecision

Publication bias

[8]

Unclear risk of performance bias in blinding

Low risk of bias

Low risk bias

Unclear risk of imprecision

Low risk bias

[10]

Unclear risk of performance bias in randomization

Low risk of bias

Low risk of bias

Unclear risk of imprecision

Low risk of bias

[11]

Unclear risk of performance bias in blinding

Low risk of bias

Low risk of bias

Unclear risk of imprecision

Low risk of bias

[12]

Low risk of bias

Low risk of bias

Low risk of bias

Risk of imprecision

Low risk of bias

[13]

Unclear risk of performance bias in blinding

Low risk of bias

Low risk of bias

Risk of imprecision

Low risk of bias