Scolaris Content Display Scolaris Content Display

Study flow diagram.
Figuras y tablas -
Figure 1

Study flow diagram.

Risk of bias summary: review authors' judgments about each 'Risk of bias' item for each included study. Red (‐) = high risk of bias, yellow (?) = unclear risk of bias, green (+) = low risk of bias.
Figuras y tablas -
Figure 2

Risk of bias summary: review authors' judgments about each 'Risk of bias' item for each included study. Red (‐) = high risk of bias, yellow (?) = unclear risk of bias, green (+) = low risk of bias.