Reason that past clinical studies, focusing on health-care worker outcomes, are not the best indicator is that masks for *source-control* is not an individual level variable. It's like asking if filters on car exhausts lower air pollution by measuring the air ... inside each car.
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I mean you find a lot of this. …https://www-sciencedirect-com.libproxy.lib.unc.edu/science/article/pii/S0140673603131686 … Masks work to protect health-care workers. You find those across the board.
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