Nat. Genet. 47, 643–646 (2015); published online 27 April 2015; corrected after print 12 January 2016

In the version of this article initially published, one of the variants was incorrectly reported as c.634C>T. The correct nomenclature for this variant is c.643C>T. The error has been corrected in the HTML and PDF versions of the article.