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Correction to: European Journal of Human Genetics advance online publication, 6 June 2012; doi:10.1038/ejhg.2012.104
Since the publication of this article one of the authors, Herbert Gottweis, has asked for an additional affiliation to be added. This has now been added and the amended article appears in this issue. The HTML and online PDF versions have also been amended and now carry the additional affiliation.
