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/cloudfront-us-east-2.images.arcpublishing.com/reuters/5C3R4FSHWJI5ZNU4SGV3SIOL5E.jpg "Explainer: N95? KF94? Which mask is best at protecting against COVID-19 | Reuters")
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What is the efficacy of standard face masks compared to respirator masks in preventing COVID-type respiratory illnesses in primary care staff? - The Centre for Evidence-Based Medicine
