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Why simple cloth masks without valves are better at stopping the spread of COVID-19 – SF Gate

http://www.washingtonpost.com/health/why-simple-cloth-masks-without-valves-are-better-at-fighting-the-spread-of-covid-19/2020/06/26/c445fca6-b574-11ea-aca5-ebb63d27e1ff_story.html

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