Face masks help control transmission of COVID-19.

Lancet Digit Health

Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore 117549, Singapore.

Published: March 2021

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7817407PMC
http://dx.doi.org/10.1016/S2589-7500(21)00003-0DOI Listing

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