Fig. 2
Cochrane risk of bias assessment. a For individual RCTs. b Overall. Red (−): high risk of bias; Yellow (?): unknown risk of bias; Green (+): low risk of bias
Fig. 2 | Human Resources for Health
Cochrane risk of bias assessment. a For individual RCTs. b Overall. Red (−): high risk of bias; Yellow (?): unknown risk of bias; Green (+): low risk of bias
Human Resources for Health