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by ThePowerOfFuet 1033 days ago
https://www.mpg.de/17916867/coronavirus-masks-risk-protectio...

https://pubmed.ncbi.nlm.nih.gov/8452097/

1 comments

First link is an article that merely summarize following link. Not exactly the peer-reviewable source.

Second link also has zero “actionable” citation and scarily so, has a paltry 84 citations-by. Making this actionless, “citation-free” paper an even terrible source.

Sole reference: https://www.pnas.org/syndication/doi/10.1073/pnas.2110117118