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Coronavirus: how worried should I be about the shortage of face masks? Or can I just use a scarf? | Centre for Research Excellence Integrated Systems for Epidemic Response
CDC study finds 2 masks are better than 1 vs. COVID-19 - OPB
Should I really wear 2 masks? Hear from an expert | CU Boulder Today | University of Colorado Boulder
What is the best mask for COVID-19? A mechanical engineer explains the science after 2 years of testing masks in his lab
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Are two face masks better than one? | Coronavirus | The Guardian
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CDC urges that people double mask or to wear masks that fit - The Washington Post
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