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. 2021 Nov 9;16(11):e0259821. doi: 10.1371/journal.pone.0259821

Fig 3. Review authors’ judgements about each risk of bias item for included studies [51–58].

Fig 3

Positive (+) values represent a low risk of bias, question marks (?) represent an unclear risk of bias, and negative (-) values represent a high risk of bias (generated via RevMan 5.4.1).