Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021 | MMWR
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Will one-way masking protect you from COVID in public spaces? : Goats and Soda : NPR
An upper bound on one-to-one exposure to infectious human respiratory particles | PNAS
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Face mask, face shield, FFP2, N95 — what's the difference? – DW – 06/29/2021
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Mask-wearing and control of SARS-CoV-2 transmission in the USA: a cross-sectional study - The Lancet Digital Health
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