RT Journal Article SR Electronic T1 Hypoxaemia in COVID-19: many pieces to a complex puzzle JF European Respiratory Review JO EUROPEAN RESPIRATORY REVIEW FD European Respiratory Society SP 220090 DO 10.1183/16000617.0090-2022 VO 31 IS 164 A1 Mattia Busana A1 Luigi Camporota A1 Luciano Gattinoni YR 2022 UL http://err.ersjournals.com/content/31/164/220090.abstract AB