1. Department of Neuroscience, Neurosurgery, Imperial College of London, Charing Cross Hospital, London, UK
2. Department of Neurology and Psychiatry, Neurosurgery, University of Rome “Sapienza”, Rome, Italy
3. Department of Neurological Surgery, Wexner Medical Center, The Ohio State University College of Medicine, Columbus, OH, USA
4. Department of Neurosurgery, King’s College of London, London, UK