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Expression of Concern: The introduction of a mandatory mask policy was associated with significantly reduced COVID-19 cases in a major metropolitan city
The PLOS ONE Editors
(2023)
Expression of Concern: The introduction of a mandatory mask policy was associated with significantly reduced COVID-19 cases in a major metropolitan city.
PLOS ONE 18(4): e0284939.
https://doi.org/10.1371/journal.pone.0284939