1. Department of Medicine and Surgery, University of Parma, Parma, Italy
2. Istituto per le Tecnologie Didattiche, National Research Council, Genova, Italy
3. Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
4. IRCCS Istituto delle Scienze Neurologiche di Bologna, Italy
5. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy