1. Department of Neurosurgery, King’s College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK
2. Department of Neurosciences and Reproductive and Dental Sciences, Division of Neurosurgery, University of Naples, “Federico II”, Via S. Pansini, 80131 Naples, Italy
3. Department of Neurophysiology, King’s College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK