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I know I've disparaged Trish Greenhalgh here previously for a couple of things, but, specifically refusing to say the word "mask" before, and instead using "face coverings" in places like her Oxford bio. So it's only fair that I post about her latest paper. I'd reply directly to where I said that before, but I can't search on this instance and I can't find it.
This is really good work, and specifically discusses different masks and respirators clearly.
