ahh first page of a google search
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662657/
https://www.pnas.org/content/118/4/e2014564118
https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/masking-science-sars-cov2.html
https://med.stanford.edu/news/all-news/2021/09/surgical-masks-covid-19.html
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What’s so bloody hard about wearing a mask where and when required?, page-75
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