1 The Royal Children's Hospital, Melbourne, Australia. Electronic address: erich_rutz@hotmail.com.
2 The Royal Children's Hospital, Melbourne, Australia; Department of Paediatrics, The University of Melbourne, Melbourne, Australia.
3 The Royal Children's Hospital, Melbourne, Australia; Honorary Fellow Murdoch Children's Research Institute, Senior Physiotherapist, Gait Laboratory Manager, Hugh Williamson Gait Analysis Laboratory, The Royal Children's Hospital, Melbourne, Australia.
4 The Royal Children's Hospital, Melbourne, Australia; Hugh Williamson Gait Analysis Laboratory, The Royal Children's Hospital Developmental Imaging, Murdoch Children's Research Institute, Australia; Department Biomedical Engineering, Department Paediatrics, The University of Melbourne, Australia.
5 The Royal Children's Hospital, Melbourne, Australia.