1. INSERM, U1094; Tropical Neuroepidemiology; Limoges France
2. Univ. Limoges; UMR_S 1094; Tropical Neuroepidemiology; Institute of Neuroepidemiology and Tropical Neurology; CNRS FR 3503 GEIST; F-87000 Limoges France
3. CHU Limoges; Centre d'Epidémiologie de Biostatistique et de Méthodologie de la Recherche; Limoges France
4. Laboratorio di Malattie Neurologiche; Dipartimento di Neuroscienze; IRCCS Istituto di Ricerche Farmacologiche Mario Negri; Milano Italy
5. CHU Lyon Hôpital Neurologique P. Wertheimer; Electromyographie et pathologies neuromusculaires; Lyon France
6. CHU Limoges; Service de Neurologie; Centre Expert SLA; Limoges France
7. CHU Clermont-Ferrand; Hopital Gabriel Montpied; Service de Neurologie; Centre Expert SLA; Clermont-Ferrand France
8. CHU Pellegrin; Service de Neurologie; Centre Expert SLA; Bordeaux France
9. CHU Toulouse Purpan; Centre Expert SLA; Unité de neurophysiologie clinique; Toulouse France
10. CHU Saint-Étienne; Hôpital Nord; Service de Neurologie; Centre Expert SLA; Saint-Étienne France
11. Department of Basic Medical Sciences; Neuroscience and Sense Organs; University of Bari ‘Aldo Moro’; Bari Italy
12. Unit of Neurodegenerative Diseases; Department of Clinical Research in Neurology; University of Bari ‘Aldo Moro’; at Pia Fondazione Cardinale G. Panico; Tricase Lecce Italy