Queensland Cerebral Palsy and Rehabilitation Research Centre, UQ Child Health Research Centre, Faculty of Medicine, The University of Queensland, South Brisbane, Queensland, Australia. Electronic address: j.gillett1@uq.edu.au. Centre for Sensorimotor Performance, School of Human Movement and Nutrition Sciences, The University of Queensland, St Lucia, Queensland, Australia. Electronic address: g.lichtwark@uq.edu.au. Queensland Cerebral Palsy and Rehabilitation Research Centre, UQ Child Health Research Centre, Faculty of Medicine, The University of Queensland, South Brisbane, Queensland, Australia. Electronic address: r.boyd@uq.edu.au. School of Allied Health Sciences and Menzies Health Institute Queensland, Griffith University, Southport, Queensland, Australia; Queensland Children's Motion Analysis Service, Children's Health Queensland Hospital and Health Service, South Brisbane, Queensland, Australia; Department of Orthopaedics, Children's Health Queensland Hospital and Health Service, South Brisbane, Queensland, Australia. Electronic address: c.carty@griffith.edu.au. Queensland Cerebral Palsy and Rehabilitation Research Centre, UQ Child Health Research Centre, Faculty of Medicine, The University of Queensland, South Brisbane, Queensland, Australia; School of Health, Medical and Applied Sciences, Central Queensland University, Bundaberg, Queensland, Australia. Electronic address: l.barber@cqu.edu.au.