Face masks for the public during the covid-19 crisis

@article{Greenhalgh2020FaceMF,
  title={Face masks for the public during the covid-19 crisis},
  author={Trisha Greenhalgh and Manuel B Schmid and Thomas Czypionka and Dirk Bassler and Laurence Gruer},
  journal={BMJ},
  year={2020},
  volume={369}
}
Trisha Greenhalgh and colleagues argue that it is time to apply the precautionary principle 
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