COVID-19(65) Patient(45) ICU(29) mechanical ventilation(28) ARDS(23) material(23) with COVID-19(22) Mortality(20) Critically ill(19) COVID-19 patient(16) SARS-CoV-2(16) collected(15) Characteristics(14) Critically ill patient(14) significantly(14) Pneumonia(13) Admission(13) COVID-19 patients(12) outcome(11) age(11) respiratory(11) median(11) baseline(11) coronavirus disease(10) PaO(10) acute respiratory distress syndrome(10) Coronavirus disease 2019(10) patients(9) Biomarker(9) was performed(9)