Effects of wearing a mask. NIH study. Link in comments.
(media.greatawakening.win)
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This is a fantastic find! It's from 2012, but there is a lot of good information in the publication.
When I open the link, t says it was published online Nov, 2020 and Med Hypotheses, Jan 2021. So where are you seeing 2012?
It says it at the top
"PLoS One. 2012; 7(4): e35421.
Published online 2012 Apr 20. doi: 10.1371/journal.pone.0035421
PMCID: PMC3335060 PMID: 22536382"