1 Department of Neurosurgery, Policlinico San Martino Hospital, IRCCS for Oncology and Neuroscience, Genoa, Italy; Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Maternal and Children (DINOGMI), University of Genoa, Genoa, Italy.
2 Department of Neurosurgery, Istituto Giannina Gaslini, Genoa, Italy.
3 Department of Neuroscience "Rita Levi Montalcini", Neurosurgery Unit, University of Turin, Turin, Italy. Electronic address: gel.aruta@gmail.com.