1. Laboratory of Bioengineering and Biomechanics for bone and joints (B2OA), CNRS UMR 7052 Faculty of Medecine, Paris 7 University, 10 avenue de verdun, Paris, France.
2. PFID Pasteur Institute, Paris, France.
3. Department of Pediatric Neurosurgery, Necker-Enfants Malades Hospital, Paris, France.