Effectiveness of public health measures in reducing the incidence of covid-19, SARS-CoV-2 transmission, and covid-19 mortality: systematic review and meta-analysisBMJ 2021; 375 doi: https://doi.org/10.1136/bmj.n2997 (Published 03 December 2021) Cite this as: BMJ 2021;375:n2997
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