Face masks for the public during the covid-19 crisis. Greenhalgh T, Schmid MB, Czypionka T, Bassler D, et al. BMJ 2020;369:m1435.

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Amedeo Smart

Independent Medical Education

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Greenhalgh T, Schmid MB, Czypionka T, Bassler D, et al. Face masks for the public during the covid-19 crisis. BMJ 2020;369:m1435.
PMID: 32273267