Nat. Genet. 40, 189–197 (2008); published online 13 January 2008; corrected after print 29 October 2008

In the version of this article initially published, the institutional affiliation for Dolores Corella was not complete. Her affiliation is with the Department of Preventive Medicine, School of Medicine, University of Valencia and CIBER Fisiopatología de la Obesidad y Nutrition, ISCIII, Valencia, 46010, Spain. The error has been corrected in the HTML and PDF versions of the article.