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Wearning Masks to Reduce Covid-19, July through August 2020
Covid-19 2020-08 part one

relative Covid-19 face mask efficacy      web

webhttps://www.businessinsider.com/neck-fleece-worse-coronavirus-protection-duke-study-2020-8
authorInyoung Choi
publicationBusiness Insider
date2020-08-09

does not say that they folded the bandana as usual

Documents:
Duke study on face mask efficacy for Covid-19
webEmma P. Fischer, Martin C. Fis...Science Advances2020-08-07

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