COVID-19(94) supplementary material(62) SARS-CoV-2(46) pandemic(44) age(38) Infection(36) Mortality(36) COVID-19 pandemic(30) conducted(29) death(29) risk(29) Factor(28) country(26) Epidemiology(26) Intervention(20) participant(20) Symptom(19) deaths(19) public health(18) 95% CI(18) proportion(18) intensive care(17) individual(17) COVID-19 mortality(17) reported(17) less(16) Hospitalization(16) Characteristics(16) approach(16) measure(16)