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The utility of high-flow nasal oxygen for severe COVID-19 p..:

Calligaro, Gregory L ; Lalla, Usha ; Audley, Gordon...
https://researchonline.lshtm.ac.uk/id/eprint/4660445/1/The%20utility%20of%20high-flow%20nasal%20oxygen%20for%20severe%20COVID-19%20pneumonia%20in%20a%20resource-constrained%20setting%20A%20multi-centre%20prospec.pdf.  , 2020