Ok so I randomly clicked on one of you links and it says Meta-analysis of randomized controlled trials (RCTs) indicated a protective effect of masks and respir

Ok so I randomly clicked on one of you links and it says Meta-analysis of randomized controlled trials (RCTs) indicated a protective effect of masks and respirators against clinical respiratory illness (CRI) and influenza-like illness (ILI) Meta-analysis of observational studies provided evidence of a protective effect of masks and respirators against severe acute respiratory syndrome (SARS)