Nat. Biotechnol. 36, 678–680 (2018); published online 6 August 2018; corrected after print 4 September 2018

In the version of this article initially published, author John Brodersen's name was misspelled Broderson and a second affiliation for him was missing: Primary Health Care Research Unit, Region Zealand, Denmark. The error has been corrected in the HTML and PDF versions of the article.