COVID-19(84) SARS-CoV-2(20) mechanical ventilation(16) airway management(15) Abstract(12) Tracheal intubation.(10) intensive care(9) Patient(8) coronavirus(8) Infection prevention and control(8) infection control(7) hospital(6) Trial(6) outcome(6) clinical(6) Personal protective equipment(6) ARDS(6) predicted(5) Mortality(5) prospective cohort study(5) China(5) Volume(5) titre(5) acute respiratory syndrome(5) parameter(4) Immunoglobulin(4) majority(4) Follow-up(4) Critical illness(4) personal protective equipment.(4)