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Face masks to prevent transmission of respiratory infections: Systematic review and meta-analysis of randomized controlled trials on face mask use

Fig 2

Risk of bias.

Review authors’ judgement of each of the risk-of-bias item across the included studies evaluated using the Cochrane Risk of Bias 2 tool (ROB2).

Fig 2

doi: https://doi.org/10.1371/journal.pone.0271517.g002