1. Institute of Neurology, Azienda Ospedaliero Universitaria di Cagliari, Italy
2. Department of Medical Sciences and Public Health, University of Cagliari, Italy
3. Rita Levi Montalcini Department of Neurosciences, ALS Center, University of Turin, Turin, Italy, and
4. Department of Translational Biomedicine and Neurosciences, University of Bari “Aldo Moro”, Italy