COVID-19(73) 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) Hospitalization(17) Patient(17) hospital(17) pandemic(16) Epidemiology(16) Cohort(15) coronavirus(15) confidence interval(15) Health(14) Infection(14) participant(14) adjusted(14) country(13) Admission(13) Impact(13) Factor(13) risk factor(13) seroprevalence.(12) were used(12)