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Trisha Greenhalgh
Trisha Greenhalgh is a professor of primary care health sciences at the University of Oxford.
Spencer Platt/Getty
The Real Reason to Wear a Mask
Much of the confusion around masks stems from the conflation of two very different uses.
Zeynep Tufekci
,
Jeremy Howard
, and
Trisha Greenhalgh
April 22, 2020