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Clinical features, diagnostics, and outcomes of patients presenting with acute respiratory illness: A retrospective cohort study of patients with and without COVID-19

Retrospective Cohort StudyRespiratory DiseasesCovid-19 PandemicClinical EpidemiologyClinical FeaturesRespiratory InfectionInfectious Respiratory DiseaseCovid-19 EpidemiologyAcute Respiratory IllnessPublic HealthMedicineAcute MedicineEmergency MedicineCovid-19