Clinical efficacy of hydroxychloroquine in patients with covid-19 pneumonia who require oxygen: observational comparative study using routine care data

A reader queried the competing interests statement in the paper by Mahévas and colleagues (BMJ 2020;369:m1844, doi:10.1136/bmj.m1844, published 14 May 2020). The whole author group has updated and expanded their competing interests statement on bmj.com, which now contains full details.

The article and online PDF will be updated in due course.