early treatment(1) respiratory(1) exposure(1) Pediatric patient(1) cumulative(1) Treatment(1) performed(1) Infection(1) Seroconversion(1) Clinical improvement(1) patients(1) pharmacological treatment(1) hazard ratio(1) COVID-19(1) time(1) hospital(1) groups(1) Clinical outcome(1) HIV-1(1) Hong Kong(1) COVID-19 patient(1) 95% CI(1) positive(1) Lopinavir/ritonavir(1) evaluate(1) MERS(1) Hyperinflammatory syndrome(1) age(1) COVID-19 patients(1) acute respiratory syndrome(1)