evidence: FDA issues an emergency use authorization (EUA) for "hydroxychloroquine sulfate and chloroquine phosphate products" to be donated to the Strategic National Stockpile and donated to hospitals to treat patients with COVID-19. The EUA would be rescinded June 15, except for patients in clinical trials, in the wake of reports of heart rhythm problems among some patients. [...] June 4 — Lancet, NEJM Retract COVID-19 Studies on Hydroxychloroquine [...] Just days after WHO ended its own trial, the NIH announces it is halting a clinical trial examining the safety and effectiveness of hydroxychloroquine as a treatment for COVID-19. The study indicates that the treatment does no harm, but also provides no benefit.