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/cloudfront-us-east-2.images.arcpublishing.com/reuters/3W6HYDUFZ5OKZCUPGCDGSR7GVM.jpg "Mask mandates return at some US hospitals as COVID, flu jump | Reuters")
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Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021 | MMWR
Effect of Wearing Face Masks on the Carbon Dioxide Concentration in the Breathing Zone - Aerosol and Air Quality Research
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Double masking: Which is better, two surgical masks or one N95?
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