Correction to: European Journal of Human Genetics advance online publication, 21 May 2008; doi:10.1038/ejhg.2008.100

Since the above publication the authors have noticed that second author's affiliation information is incorrect. Dr Penelope A Lind's only affiliation is:

Genetic Epidemiology, Queensland Institute of Medical Research, Brisbane, Australia.

The typesetters would like to apologise for this mistake.