. "Medline; PMC" . "no-cc" . "10.1002/bjs.11888" . "COVID\u201019: Surgical masks and respirators in the operating theatre" . "32737985" . . "Buckley, JC" . . "Waterston, S" . . "McGhee, JT" . "2020-08-01"^^ . . . . "32737985" . "PMC7436542" . . "Br J Surg" . "Gannon, M" .