This meta-analysis suggests that masks are effective for both healthcare workers and not healthcare workers on a population level. https://www.sciencedirect.co

This meta-analysis suggests that masks are effective for both healthcare workers and not healthcare workers on a population level. https://www.sciencedirect.com/science/article/pii/S1477893920302301 https://www.sciencedirect.com/science/article/pii/S147789392...