1. Department of Neurosurgery, Fondazione IRCCS Istituto Neurologico C. Besta, University of Milan, Milan, Italy;
2. Neurophysiopathology Unit, Fondazione IRCCS Istituto Neurologico C. Besta, University of Milan, Milan, Italy;
3. Department of Neurosurgery, “G.Rodolico” University Hospital, Catania, Italy;
4. Neuroradiology Department, Villa Silvia Hospital, Senigallia, AN, Italy