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