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Greenhalgh, T., Schmid, M., Czypionka, T., Bassler, D. & Gruer, L. 2020, 'Face masks for the public during the covid-19 crisis', BMJ, 369, article no: m1435. http://dx.doi.org/10.1136/bmj.m1435

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Last updated: 17 June 2022
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