RT Journal Article SR Electronic T1 Novel gas exchange analysis in COVID-19 lung disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 2201962 DO 10.1183/13993003.01962-2022 VO 61 IS 1 A1 Mike Hughes YR 2023 UL http://erj.ersjournals.com/content/61/1/2201962.abstract AB