Background Widespread use of respiratory protection masks has become a critical component of public health response.
Correspondence to Joanne Foody Cardiovascular Medicine, Faulkner Hospital, 1153 Centre Street, Jamaica Plain, MA 02130, USA; jfoody{at}partners.org ...
Correspondence to: Dr Stephen Honeybul, Department of Neurosurgery, Sir Charles Gairdner Hospital and Royal Perth Hospital, Perth, Western Australia, Australia; stephen.honeybul{at}health.wa.gov.au ...
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