Nature Communications 6: Article number: 6046 (2015); Published 5 February 2015; Updated 6 July 2015

The affiliation details for Emiliano Giardina are incorrect in this Article. The correct address for this author is given below:

Department of Biopathology, Centre of Excellence for Genomic Risk Assessment in Multifactorial and Complex Diseases, School of Medicine, University of Rome ‘Tor Vergata’ and Laboratory of Molecular Genetics UILDM, Fondazione Santa Lucia, Rome 00179, Italy.