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Commentary
Why I wear a mask indoors and out
BMJ 2021; 373 doi: https://doi.org/10.1136/bmj.n1055 (Published 28 April 2021) Cite this as: BMJ 2021;373:n1055Linked Head to Head
Should masks be worn outdoors?
Linked Feature
What do we know about airborne transmission of SARS-CoV-2?