A retraction notice was published regarding the study titled: “Hydroxychloroquine or chloroquine with or without a macrolide for treatment of COVID-19: a multinational registry analysis,” which appeared in The Lancet on May 22nd. 

• Concerns about the data were raised and the authors launched an independent third-party peer review of the source of the data, held by Surgisphere
• Surgisphere refused to transfer the full data set, leading to their withdrawal of the paper
• The authors also used Surgisphere for a data set published in NEJM, which is also being retracted
• Of note: this study had found increased frequency of ventricular arrhythmia and in-hospital mortality, causing a temporary halt of its use within a large study, called SOLIDARITY trial, by the World Health Organization.