Our new BMJ paper:
It& #39;s time to apply the precautionary principle to face masks
https://www.bmj.com/content/bmj/369/bmj.m1435.full.pdf">https://www.bmj.com/content/b...
It& #39;s time to apply the precautionary principle to face masks
https://www.bmj.com/content/bmj/369/bmj.m1435.full.pdf">https://www.bmj.com/content/b...