COVID-19(74) SARS-CoV-2(44) Mortality(34) Result(33) death(33) age(32) Sex(21) COVID-19 pandemic(21) SARS-COV-2 infection(20) risk(20) tested(17) hospital(17) Epidemiology(17) Patient(17) Hospitalization(17) pandemic(16) Cohort(15) confidence interval(15) Seroprevalence(15) coronavirus(15) participant(14) adjusted(14) Infection(14) Health(14) Factor(13) Admission(13) Impact(13) country(13) risk factor(13) baseline(12)