Hydroxychloroquine
Azithromycin
Observational study
Medicine
Coronavirus disease 2019 (COVID-19)
Retrospective cohort study
2019-20 coronavirus outbreak
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
Internal medicine
Virology
Antibiotics
Biology
Disease
Outbreak
Infectious disease (medical specialty)
Microbiology
