Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers

A Randomized Controlled Trial Henning Bundgaard, DMSc ,  Johan Skov Bundgaard, BSc , … View all authors  Author, Article and Disclosure Information https://doi.org/10.7326/M20-6817 Background: Observational evidence suggests...

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