Are Face Masks Effective? The Evidence (swprs.org)

This is from the Swiss Policy Research group, previously Swiss Propaganda Research.

Their financial backing, contributors and members are unknown and they have previously been responsible for spreading covid misinformation and also qanon nonsense.

Probably worth giving this 'research a miss'.

I’d suggest reading the linked sources. For example, the summary of the of the EU CDC analysis is somewhat deceptive.

I've never heard of this organization, but here's one of the scientists on President Biden's Covid advisory council being interviewed on PBS.

https://www.pbs.org/wnet/amanpour-and-company/video/do-masks...

Here's the Wikipedia entry on them -- they're definitely a misinformation monger.

https://en.wikipedia.org/wiki/Swiss_Policy_Research