COVID-19(94) supplementary material(62) SARS-CoV-2(46) pandemic(45) age(38) Mortality(36) Infection(36) COVID-19 pandemic(30) risk(29) conducted(29) death(29) Factor(28) Epidemiology(26) country(26) participant(20) Intervention(20) deaths(19) approach(19) Symptom(19) 95% CI(18) proportion(18) public health(18) reported(17) individual(17) intensive care(17) COVID-19 mortality(17) less(16) measure(16) Characteristics(16) Hospitalization(16)