1 Department of Neurology I.C., Oasi Institute for Research on Mental Retardation and Brain Aging (IRCCS), Via Conte Ruggero, 73-94018 Troina, Italy. Electronic address: glanza@oasi.en.it.
2 Department of Neurology I.C., Oasi Institute for Research on Mental Retardation and Brain Aging (IRCCS), Via Conte Ruggero, 73-94018 Troina, Italy.
3 Spinal Unit, Emergency Hospital "Cannizzaro", Via Messina, 829-95126 Catania, Italy.
4 Department of Medical and Surgical Sciences and Advanced Technologies, Section of Neurosciences, University of Catania, Via Santa Sofia, 78-95123 Catania, Italy.
5 Department of Surgery and Medical-Surgical Specialties, University of Catania, Via Santa Sofia, 78-95123 Catania, Italy.