World Health Organization: WHO Director-General’s opening remarks at the media briefing on COVID-19. https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---11-march-2020, (accessed 2020-7-14).
Nianyi Z, Zewen Li, Sherrianne Ng, et al: Epidemiology reveals mask wearing by the public is crucial for COVID-19 control. Medi Microecology 4: 100015, 2020.
Eikenberry SE, Mancuso M, Iboi E, et al: To mask or not to mask: Modeling the potential for face mask use by the general public to curtail the COVID-19 pandemic. Infect Dis Model 5: 293-308, 2020.