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Facemasks in the COVID-19 era: A health hypothesis

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/ 2021 Jan; 146: 110411. Published online 2020 Nov 22. doi: 10.1016/j.mehy.2020.110411 PMCID: PMC7680614 PMID: 33303303 Facemasks in the COVID-19 er