1. Department of Orthopaedic Surgery, University of Alabama at Birmingham, Birmingham, AL, USA
2. Department of Orthopaedic Surgery, Hiroshima University, Hiroshima, Japan
3. Royal Victoria Hospital and Royal Belfast Hospital for Sick Children, Belfast, UK
4. Department of Surgical Sciences, Uppsala University Hospital, Uppsala, Sweden
5. Department of Pediatric Neurosurgery, University of California, Davis, CA, USA
6. Regional Centre for Paediatric Neurosurgery, Kaiser Permanente Hospitals, Oakland, CA, USA
7. Great Ormond Street Hospital For Children, NHS Trust, London, UK