Face masks in the covid-19 crisis: caveats, limits, and priorities

We agree with Greenhalgh and colleagues that decision making should be based on scientific knowledge, but when knowledge is incomplete, as in the current pandemic, judgments based on precaution and pragmatism become increasingly necessary.1 The Association of Schools of Public Health in the European Region’s report launched on 24 April recommends the use of face masks by the general public, with clear caveats, limits, and priorities.2 Non-medical grade …

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