"According to a protocol-based treatment algorithm, among hospitalized patients, use of hydroxychloroquine alone and in combination with azithromycin was associated with a significant reduction in-hospital mortality compared to not receiving hydroxychloroquine." -- https://www.ijidonline.com/article/S1201-9712(20)30534-8/fulltext [www ijidonline com]

This one put me through no less than four redirects through Elsevier (I know I spelled it wrong; the monopolist that controls scientific journal publishing).

This study is one of several I've come across recently suggesting that the malaria drug #hydroxychloroquine may indeed be a useful treatment for #COVID-19. I usually read the abstracts, not the full documents.