Some wore masks, others didn’t. The marines who very strictly cleaned, wore masks got sick anyways.
https://www.nejm.org/doi/full/10.1056/NEJMoa2029717
2021-02-03
Some wore masks, others didn’t. The marines who very strictly cleaned, wore masks got sick anyways.
https://www.nejm.org/doi/full/10.1056/NEJMoa2029717
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