Nature Reviews Rheumatology 13, 234–243 (2017)

In 'Gastrointestinal perforation' of the 'Adverse effects of JAK inhibitors' section, in the sentence β€œIn patients with RA receiving baricitinib, two cases of gastrointestinal perforations were reported (an incidence of 5 cases per 1,000 patient-years in the development program)” the incidence should have been 0.5 cases per 1,000 patient-years. This error has been corrected in the online version of the article.