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Different spin on the wearing of masks.
#24
Masks for all is not based on sound data, say these two experts on respiratory protection.

https://www.cidrap.umn.edu/news-perspect...sound-data
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Different spin on the wearing of masks. - by rgG - 04-04-2020, 08:48 PM
Re: Different spin on the wearing of masks. - by Sam3 - 04-05-2020, 01:40 PM

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