After all the discussion over masks it was nice to see an actual study done on them. https://www.acpjournals.org/doi/10.7326/M20-6817 https://www.acpjournals.o

After all the discussion over masks it was nice to see an actual study done on them. https://www.acpjournals.org/doi/10.7326/M20-6817 https://www.acpjournals.org/doi/10.7326/M20-6817