Ba ikerketa honen eta beste askoren arabera sinismen bat baino ez da: Weak Evidence for Community Cloth Face Masking to Limit the Spread of SARS-CoV-2. Ian T. Liu, Vinay Prasad, Jonathan J. Darrow:
https://www.cato.org/sites/cato.org/files/2021-11/working-paper-64.pdf
#Maskarak
