1. Spinal Unit, Montecatone Rehabilitation Institute, Imola, Italy
2. Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
3. IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
4. Neurosurgical Department, M. Bufalini Hospital, Cesena, Italy
5. Peripheral Nerve Surgery Unit, Ospedale per gli Infermi, Faenza, Italy