An analysis of studies pertaining to masks in Morbidity and Mortality Weekly Report: Characteristics and quality of all studies from 1978 to 2023

"0/77 were randomized studies."

https://www.medrxiv.org/content/10.1101/2023.07.07.23292338v...

Here is a pdf.

https://www.medrxiv.org/content/10.1101/2023.07.07.23292338v...