1 Department of Neurosurgery, Rennes University Hospital, 35000 Rennes, France.
2 Department of Physical Medicine and Rehabilitation, Rennes University Hospital, 35000 Rennes, France.
3 Department of Neurosurgery, Rennes University Hospital, 35000 Rennes, France; Inserm MediCIS, Unit U1099 LTSI, Rennes 1 University, Rennes, France. Electronic address: [email protected].