COVID-19(23) Abstract(21) SARS-CoV-2(13) Patient(11) material(8) Infection(7) risk(7) virus(6) Blood(6) Analysis(6) COVID-19 pandemic(6) hospital(5) death(5) coronavirus(5) patients(5) pandemic(5) COVID-19 patient(4) COVID-19 patients(4) outbreak(4) help(4) Mortality(4) knowledge(4) predict(4) analyzed(4) Spread(4) Vaccine(4) disease(4) the disease(4) Epidemiology(3) Prevent(3)