1. Department of Neurosurgery La Pitié Salpétrière Hospital‐APHP Paris France
2. Department of Neurosurgery Bretonneau Hospital Tours France
3. Department of Orthopaedic Surgery Trousseau Hospital Tours France
4. Department of Neurosurgery/Neurotraumatology Hotel‐Dieu Hospital Nantes France
5. Department of Orthopaedic Surgery La Pitié‐Salpêtrière Hospital‐APHP Paris France
6. Department of Orthopaedic Surgery Mondor Hospital‐APHP Créteil France