COVID-19(51) Result(47) Patient(44) ICU(35) supplementary material(29) Mortality(26) outcome(23) SARS-CoV-2(21) COVID-19 patient(21) intensive care(19) mechanical ventilation(17) Critically ill(16) Admission(16) Critically ill patient(16) patients(15) hospital(15) age(15) risk(15) 95% CI(15) syndrome(14) ARDS(14) Treatment(13) Respiratory failure(13) performed(13) intensive care unit(13) coronavirus(12) ICU admission(12) median(12) therapy(12) acute respiratory distress(12)