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unclear whether masks reduce the spread of Covid-19

virus shedding in breath and efficacy of face masks      web

webhttps://www.nature.com/articles/s41591-020-0843-2#auth-14
authorNancy H. L. Leung, Daniel K. W. Chu
publicationNature Medicine
date2020-04-03

Documents:
virus shedding in breath and efficacy of face masks (pdf)
webNancy H. L. Leung, Daniel K. W...Nature Medicine2020-04-03

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