COVID-19(107) SARS-CoV-2(89) Result(73) Patient(61) pandemic(55) COVID-19 pandemic(50) supplementary material(47) hospital(45) HCW(42) infection control(42) Care(42) measure(42) outbreak(41) healthcare worker(39) Personal protective equipment(38) Infection(38) Transmission(37) healthcare(37) coronavirus(35) HCWs(34) Infection prevention(34) reported(32) PPE(31) COVID-19 patient(31) Analysis(31) acute respiratory syndrome(28) COVID-19 patients(27) effective(27) coronavirus disease(26) risk factor(25)