COVID-19(407) Result(173) COVID-19 pandemic(168) country(107) pandemic(93) Health(93) risk(85) SARS-CoV-2(83) Care(82) death(73) conducted(68) measure(66) 95% confidence interval(62) Patient(58) reported(57) Infection(52) outbreak(49) age(47) Analysis(46) outcome(44) identify(44) performed(44) Community(43) Spread(41) children(40) Treatment(40) Evidence(39) lesson(38) Vaccine(36) database(36)