From the study. LOL
“We do not know whether masks shorten the travel distance of droplets during coughing. “
Here’s the full write up.
https://annals.org/aim/fullarticle/2764367/effectiveness-surgical-cotton-masks-blocking-sars-cov-2-controlled-comparison
And it ends with the universal research study conclusion...”Further study is needed...”
IOW, “send more money.”