Problem
1) Evaluate the data that was generated on the efficacy of wearing masks to prevent COVID-19 infection.
2) Summarize the key studies which have contributed to our current understanding of mask efficacy in preventing COVID infections:
a) laboratory studies, randomized controlled trials; study design, sample sizes, follow up studies, etc.
b) What were their findings? What was measured? Are they reputable and significant? Are there any limitations or shortcomings in the studies or conclusions?