1. Department of Neurosurgery Rennes University Hospital Rennes France
2. Department of Neurosurgery Angers University Hospital Angers France
3. Department of Neurosurgery North University Hospital Assistance Publique ‐ Hopitaux de Marseille Marseille France
4. Department of Neurosurgery HautepierreUniversity Hospital Strasbourg France
5. Department of Otorhinolaryngology‐Head and Neck Surgery Rennes University Hospital Rennes France