Nature Communications 6: Article number:7138 (2015); Published: 7 July 2015; Updated: 26 October 2015

The original version of this Article contained typographical errors in the spelling of the authors Sébastien Küry, Edward L. Giovannucci and Mathieu Lemire, which were incorrectly given as Sebastian Kury, Edward L. Giocannucci and Mathiew Lemire. This has now been corrected in both the PDF and HTML versions of the Article.