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Surgical masks more effective if worn with 3D-printed frame, Concordia PhD student finds - Concordia University
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What are surgical masks and respirators, and why are they important in the fight against COVID-19? | PBS NewsHour
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Amazon.com: BYD CARE Single Use Disposable 3-Ply Mask, ASTM Level 3, Daily protection for men and women for Home, Office, School, Restaurants, Gyms, Outdoor and Indoor, Box of 50 PCs : Industrial
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