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Publisher's Note: Correction to Acknowledgments

Posted by PLOS_ONE_Group on 11 Dec 2009 at 20:14 GMT

We would like to acknowledge the contributions of Michael van Ginkel, Scott Singleton, Bernadette
http://plosone.org/article/info:doi/10.1371/journal.pone.0008021#article1.back1.ack1.p1

A funding source was omitted from the acknowledgments. CEMG is supported in part by the NIHR Manchester Biomedical Research Centre.

No competing interests declared.