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Ingenuity during the COVID-19 pandemic: a controlled experiment for respirator mask efficacy testing

 

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Dec 2020605739
Jan 2021100999242
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Apr 2021746522
May 2021525117
Jun 2021666321
Jul 2021322915
Aug 202152477
Sep 2021423625
Oct 2021494431
Nov 2021323122
Dec 2021312620
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Feb 2022343510
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May 2022424210
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Jul 20233710
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Sep 20231400
Oct 20236801
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Dec 20235421
Jan 20246034
Total26262096447