In their editorial Greenhalgh et al advise that surgical masks should be worn in public to prevent some transmission of covid-19,1 adding that we should sometimes act without definitive evidence, just in case. Two side effects of wearing face masks in public have already been highlighted:
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Lazzarino et al. (2020) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: