Mask-wearing and control of SARS-CoV-2 transmission in the USA: a cross-sectional study.
Lancet Digit Health. 2021 Mar;3(3):e148-e157. doi: 10.1016/S2589-7500(20)30293-4. Epub 2021 Jan 19.
Lancet Digit Health. 2021.
PMID: 33483277
Free PMC article.