A British research team has concluded that hydroxychloroquine is not an effective treatment for COVID-19 and has halted its use in the United Kingdom's RECOVERY trial. That trial was established in March to evaluate the efficacy of various medicines for the treatment of COVID-19. The Independent Data Monitoring Committee for the trials conducted an unblinded review of the hydroxychloroquine data. Based on that review, the researchers have concluded that "there is no beneficial effect of hydroxychloroquine in patients hospitalised with COVID-19." Martin Landray, one of the principal investigators, told reporters: "This is not a treatment for COVID-19. It doesn't work."...