There actually is a citation buried in the text "Wearing a mask significantly reduces the chances of spreading COVID-19 from you to others" "From you to others

There actually is a citation buried in the text "Wearing a mask significantly reduces the chances of spreading COVID-19 from you to others" "From you to others" is a link to a preprint by fast.ai titled Face Masks Against COVID-19: An Evidence Review Direct link: http://files.fast.ai/papers/masks_lit_review.pdf http://files.fast.ai/papers/masks_lit_review.pdf