Face masks for the public during the covid-19 crisis.
Greenhalgh, Trisha professor 1; Schmid, Manuel B consultant 2, 3; Czypionka, Thomas chief health economist 4, 5; Bassler, Dirk professor 2, 3; Gruer, Laurence professor 6, 7
[Miscellaneous Article] BMJ. 369:m1435, April 11, 2020.

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