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Counterfeiters have flooded the market for N95 and KN95 masks. Here's how to buy real ones. - The New York Times
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How to shop for medical masks like N95s, KN95s and KF94s and how to spot fakes : Shots - Health News : NPR
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Effectiveness of N95 Masks against SARS-CoV-2: Performance Efficiency, Concerns, and Future Directions | ACS Chemical Health & Safety
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Testing whether uncertified N95 masks are effective | MIT News | Massachusetts Institute of Technology
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