Leaked paper submitted to NEJM suggests hydroxychloroquine ineffective

I don't work in this field, but the authors seem to be suggesting that hydroxychloroquine makes some things significantly worse. Patients who took hydroxychloroquine were much more likely to "need" supplementary oxygen. However, the two groups of patients were in two different hospitals. The paper doesn't discuss whether each hospital used exactly the same definition of "need" and had staff policies/practices that assessed this need with exactly the same amount of diligence.

Hopefully we get some update on the WHO test that is announced in this document: "20,000 healthcare workers [will receive] chloroquine [and] will be tested daily as currently used in the treatment of rheumatoid arthritis for three months or until they are diagnosed with COVID-19." [1]

[1]: https://www.who.int/blueprint/priority-diseases/key-action/R...