1 Department of Medical and Surgical Sciences and Advanced Technologies, Section of Neurosciences, Azienda Ospedaliero Universitaria Policlinico Vittorio Emanuele, Catania, Italy.
2 Department of Neurology IC, "Associazione OASI Maria SS", Troina, Italy.
3 Department of Radiology and Radiotherapy, Azienda Ospedaliero Universitaria Policlinico Vittorio Emanuele, Catania, Italy.
4 Department of Specialita Medico-Chirurgiche, Azienda Ospedaliero Universitaria Policlinico Vittorio Emanuele, Catania, Italy.