^aGenetic Health Queensland, Royal Brisbane and Women's Hospital

^bRoyal Children's Hospital, Brisbane, Queensland, Australia

Correspondence to Associate Professor Julie McGaughran, MD, Royal Brisbane and Women's Hospital, Herston, Brisbane 4029, Australia

Tel: +61 7 3636 1686; fax: +61 7 3636 1987;

e-mail: [email protected]

Received 6 January 2009 Accepted 19 February 2009