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When to replace fabric face masks
By Grace Dickinson
A New Study Questions Whether Masks Protect Wearers. You Need to Wear Them Anyway. (Published 2020)
By Gina Kolata
Landmark Danish study finds no significant effect for facemask wearers
By Carl Heneghan & Tom Jefferson
Danish study finds face masks provide limited protection to wearer
By Catherine Evans & Jacob Gronholt