1. Department of Paediatric Surgery, Hôpital Necker Enfants Malades, Paris Descartes University, Paris, France.
2. Department of Orthopedic Surgery, Hôpital Necker Enfants Malades, Paris Descartes University, Paris, France.
3. Department of Radiotherapy, Gustave-Roussy Institute, Paris, France.
4. Department of Pediatric Oncology, Gustave-Roussy Institute, Paris, France.