Still Confused About Masks? Here's the Science Behind How Face Masks Prevent Coronavirus
Bai, Nina. “Still Confused About Masks? Here’s the Science Behind How Face Masks Prevent Coronavirus.” UC San Francisco, The Regents of The University of California, 27 May 2021, [http://www.ucsf.edu/news/2020/06/417906/still-confused-about-masks-heres-science-behind-how-face-masks-prevent].