1. Medical Engineering Research Group, Faculty of Science and EngineeringAnglia Ruskin University Chelmsford United Kingdom
2. Leon Root, Motion Analysis LaboratoryHospital for Special Surgery New York New York
3. Sports Medicine and Hip Preservation CentreHospital for Special Surgery New York New York
4. Institute for Limb Lengthening and Reconstruction, Limb Lengthening and Deformity ServiceHospital for Special Surgery New York New York