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- Duke University study suggests not all masks are created equally WCNC.com
- Researchers created a test to determine which masks are the least effective CNN
- Study Finds Not All Face Coverings Offer The Same Level Of Protection Against Spreading Coronavirus CBS Pittsburgh
- Facemask efficacy for filtering expelled droplets during speech: Evaluation Outbreak News Today
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August 09, 2020 at 08:59AM
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Duke University study suggests not all masks are created equally - WCNC.com
Health - Latest - Google News
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