1. Department of Biomedical and Biotechnological Science, University of Catania, Via S. Sofia 64, 95125 Catania, Italy
2. IRCCS Centro Neurolesi “Bonino Pulejo”, S. S. 113, Contrada Casazza, 98124 Messina, Italy
3. Rehabilitation Unit, AOU Policlinico “G. Martino”, 98124 Messina, Italy
4. Spinal Cord Unit, Cannizzaro Hospital, 95126 Catania, Italy