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