RT Journal Article SR Electronic T1 National Early Warning Score 2 (NEWS2) to identify inpatient COVID-19 deterioration: The importance of pO2:FiO2 ratio JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP e315 OP e316 DO 10.7861/clinmed.Let.21.3.2 VO 21 IS 3 A1 Jonathan W Brand A1 David J Morrice A1 Mathew V Patteril A1 Jonathan H Mackay YR 2021 UL http://www.rcpjournals.org/content/21/3/e315.2.abstract