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  • 1. Last Updated Jan. 9, 2022
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    PMID: 34016743 
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    Ann Ig. 2021 Jul-Aug;33(4):347-359. doi: 10.7416/ai.2020.2390. Epub 2020 Dec 3.
  • 8. Model Calculations of Aerosol Transmission and Infection Risk of COVID-19 in Indoor Environments. Lelieveld J, Helleis F, Borrmann S, Cheng Y, Drewnick F, Haug G, Klimach T, Sciare J, Su H, Pöschl U. Int J Environ Res Public Health. 2020 Nov 3;17(21):8114. doi: 10.3390/ijerph17218114.
  • 9. Why cloth masks might not be enough as omicron spreads
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