COVID-19(55) Patient(48) respiratory infection(30) outcome(30) viral infection(27) Mortality(22) Pneumonia(22) Result(21) SARS-CoV-2(20) COVID-19 pandemic(17) risk(16) reported(16) Viral infection.(15) Cohort(15) age(14) Symptom(14) less(13) hospital(13) participant(13) patients(13) Primary outcome(13) randomised controlled trial(12) Health(12) conducted(12) performed(12) include(12) evaluate(12) Support(12) Admission(11) Research(11)