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Methodological quality summary: review authors' judgements about each methodological quality item for each included study. A green plus sign indicates low risk of bias, a red minus sign indicates high risk of bias and a yellow question mark indicates unclear risk of bias.
Figuras y tablas -
Figure 1

Methodological quality summary: review authors' judgements about each methodological quality item for each included study. A green plus sign indicates low risk of bias, a red minus sign indicates high risk of bias and a yellow question mark indicates unclear risk of bias.