Effectiveness of surgical, KF94, and N95 respirator masks in blocking SARS-CoV-2: a controlled comparison in 7 patients.
Infect Dis (Lond). 2020 Nov-Dec;52(12):908-912. doi: 10.1080/23744235.2020.1810858. Epub 2020 Aug 26.
Infect Dis (Lond). 2020.
PMID: 32845196