1. Department of Orthopedic Surgery Nemours Children's Hospital Delaware, Wilmington DE USA
2. Human Performance Laboratory, Faculty of Kinesiology University of Calgary Calgary Alberta Canada
3. Nemours Biomedical Research Nemours Children's Health Wilmington DE USA
4. Division of Orthopedic Surgery, Department of Surgery Sidra Medicine, Doha Qatar
5. Department of Orthopaedic Surgery, University of Melbourne, Hugh Williamson Gait Laboratory Royal Children's Hospital Melbourne Victoria Australia