1. Department of Neurosurgery, Lyon University Hospital—Hospices Civils de Lyon, Bron, France;
2. Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, Montpellier, France;
3. Institute for Neuroscience of Montpellier, INSERM U1051 (Plasticity of Central Nervous System, Human Stem Cells and Glial Tumors Research Group), Saint Eloi Hospital, Montpellier University Medical Center, Montpellier, France