Correction to: European Journal of Human Genetics (2009) 17, 444–453; doi:10.1038/ejhg.2008.208; published online 5 November 2008

Since the publication of this paper, the authors have noticed that Declan O'Rourke's and Mary D King's affiliation number 10 should read ‘Childrens University Hospital, Temple Street, Dublin, Ireland’.

The authors would like to apologise for this mistake.