There are already good retrospective observational studies out, like [0] [0] Outcomes of 3,737 COVID-19 patients treated with hydroxychloroquine/azithromycin a

There are already good retrospective observational studies out, like [0] [0] Outcomes of 3,737 COVID-19 patients treated with hydroxychloroquine/azithromycin and other regimens in Marseille, France: A retrospective analysis https://www.sciencedirect.com/science/article/pii/S1477893920302817 https://www.sciencedirect.com/science/article/pii/S147789392...