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Covid-19 masks: Which mask is best for you and when to use it | CNN
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Study shows FFP2/3 respirators might increase risk of airway complications in COVID patients
Effects of distancing and pattern of breathing on the filtering capability of commercial and custom-made facial masks: An in-vitro study | PLOS ONE
FFP3 masks: how and when nurses should ask for a PPE upgrade
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Covid: Masks upgrade cuts infection risk, research finds - BBC News
Polymers | Free Full-Text | Face Masks to Combat Coronavirus (COVID-19)—Processing, Roles, Requirements, Efficacy, Risk and Sustainability
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