This is the important part:
The objective was to search for documented adverse effects and risks of different types of mouth–nose-covering masks. Of interest here were, on the one hand, readymade and self-manufactured fabric masks, including so-called community masks and, on the other hand medical, surgical and N95 masks (FFP2 masks).
So they are mixing the results of home made garbage masks, made of shirts n shit, with professionally made masks for an specific purpose. Not synthetics designed for the job, just fabrics.
Yeah, you gonna get stupid side effects when you wrap a sweater around your mouth and nose. Congrats. You just found out you cant put a home made mask made of old sheets over your face and not suffocate a bit.
Why didnt they just do a study using N95 masks and some control groups?? Oh that wouldnt bring the results you want. Best to just search for only negative effects you find not associated with N95 masks, stack the deck with those problems, then include N95's.
It's not wrong, just stupid. Like saying "sharks will kill you always" then attributing the behavior of bull sharks to nurse sharks. They are two different things.
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