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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
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To Shave or Not to Shave: How to Correctly Wear a Mask If You Have a Beard or a Mustache, Plus, Where to Find Masks That Fit Right
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Still Confused About Masks? Here's the Science Behind How Face Masks Prevent Coronavirus | UC San Francisco
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