Letter of concern regarding »Reduction in COVID-19 infection using surgical facial masks outside the healthcare system«

We are concerned about the design and interpretation of “Reduction in COVID-19 infection using surgical facial masks outside the healthcare system,” (1) a randomized controlled trial in Denmark regarding utility of mask-wearing. At this time, a trial registration and protocol paper have been posted, and the results – which we have not seen – are expected to be published shortly. According to the…

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