1. Orthopaedic Department; The Royal Children's Hospital; Parkville Vic. Australia
2. Department of Paediatrics; University of Melbourne; Carlton Vic. Australia
3. Centre of Research Excellence in Cerebral Palsy; Murdoch Childrens Research Institute; Parkville Vic. Australia
4. Clinical Epidemiology and Biostatistics Unit; Murdoch Childrens Research Institute; Parkville Vic. Australia
5. Harvard Medical School; Boston Children's Hospital; Boston MA USA
6. Hugh Williamson Gait Laboratory; The Royal Children's Hospital; Parkville Vic. Australia