Nat. Genet. 47, 1475–1481 (2015); published online 19 October 2015; corrected after print 15 February 2016

In the version of this article initially published, the colors of the lines in the key in the top right corner of Figure 5h were incorrect. The line labeled “High” should be red and the line labeled “Low” should be blue. The error has been corrected in the HTML and PDF versions of the article.