Comparison of Mask Types Finds Key Differences in Filtration - Medscape

1. Comparison of Mask Types Finds Key Differences in Filtration  Medscape
2. Researchers Create COVID-19 Mask Filtration Effectiveness Hierarchy – Dozens of Types of New, Used, and Expired Masks Tested  SciTechDaily
3. Researchers create mask filtration effectiveness hierarchy  Medical Xpress
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