COVID-19(90) Patient(81) coronavirus disease(65) SARS-CoV-2(48) acute respiratory syndrome(39) coronavirus(37) outcome(29) hospitalised(27) Infection(27) COVID-19 patient(26) respiratory(26) multicentre(24) Coronavirus disease 2019(24) death(24) patients with COVID-19(24) hospital(23) with COVID-19(22) severe acute respiratory syndrome Coronavirus(22) age(22) patients(22) Mortality(20) IMPROVE(20) 95% CI(19) independent(19) demonstrated(19) SARS-COV-2 infection(19) individual(17) hospitalised patient(17) acute respiratory syndrome coronavirus(17) acute respiratory distress(17)