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Face masks to prevent transmission of influenza virus: a systematic review
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A cluster randomised trial of cloth masks compared with medical masks in healthcare workers
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Effects of long-duration wearing of N95 respirator and surgical facemask: a pilot study
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Preliminary report on surgical mask induced deoxygenation during major surgery
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Thank you; Ben Swann did though it's a source list from the video I shared earlier!
Reminder "covid" is the CCP/WHO designation. It should be called almost anything except that.
Also, there is a save feature that helps for saving information like this to bring up later, especially when someone in public says "prove it!"