1. Department Orthopedic Surgery, LUMC, Leiden, the Netherlands
2. Department Orthopedic Surgery, Amphia, Breda, the Netherlands
3. Knowledge Institute of Medical Specialists, Utrecht, the Netherlands
4. Juliana Children’s Hospital, The Hague & Reinier HAGA Orthopaedic Centre, Zoetermeer and Delft, the Netherlands
5. Department Orthopedic Surgery, MST, Enschede, the Netherlands
6. Department Hip Sonography, Diagnostiek voor U, Eindhoven, The Netherlands
7. Dutch Hip Patient Association “Vereniging Afwijkende Heupontwikkeling”, Nijkerk, the Netherlands
8. Department Radiology, Maastricht University Medical Center, Maastricht, the Netherlands
9. Department Orthopedic Surgery, North West Hospital Group, Alkmaar, the Netherlands
10. Department Orthopedic Surgery, CAPHRI Care and Public Health Research Institute, Maastricht University Medical Center, Maastricht, the Netherlands
11. Department Orthopedic Surgery OLVG, AUMC Amsterdam, the Netherlands