1. Department of Orthopaedic Surgery, Sint Maartenskliniek Nijmegen/Boxmeer, the Netherlands
2. Department of Orthopaedic Surgery, Meander Medical Center Amersfoort, the Netherlands
3. Department of Children’s Orthopaedics, Erasmus MC- Sophia Children’s Hospital, University Medical Center Rotterdam, the Netherlands
4. Department of Orthopaedic Surgery, Amphia Hospital Breda, The Netherlands