1. Department of Biomedical and Specialty Surgical Sciences, University of Ferrara, Ferrara, Italy,
2. INSERM, University of Limoges, CHU Limoges, UMR 1094, Tropical Neuroepidemiology, Institute of Epidemiology and Tropical Neurology, GEIST, Limoges, France, and
3. CHU Limoges, Service de Neurologie, Centre de Reférence Maladies Rares SLA et autres maladies du neurone moteur, CHU Limoges, Limoges, France