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A comment on Cloth masks do protect the wearer. Parent comment

Re:Cloth masks do protect the wearer by ketamine__ on Monday August 31, 2020 @07:51PM (#24337099)
> It only works if everyone 95% of people are wearing one, especially indoors.

If this is the only RCT for cloth masks what kind of evidence is behind your claim? Do you have a source?

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