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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
2011 1
2012 1
2015 1
2017 1
2019 2
2020 4
2021 2
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Facial mask: A necessity to beat COVID-19.
Zhai Z. Zhai Z. Build Environ. 2020 May 15;175:106827. doi: 10.1016/j.buildenv.2020.106827. Epub 2020 Mar 23. Build Environ. 2020. PMID: 32287995 Free PMC article. No abstract available.