1. Institute of Neurology, University Hospital of Cagliari, Cagliari, Italy
2. Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
3. Rita Levi Montalcini Department of Neurosciences, ALS Center, University of Turin, Turin, Italy
4. San Paolo Hospital, Bari, Italy
5. Amyotrophic Lateral Sclerosis Center, University of Cagliari, Cagliari, Italy