[1] INSERM, U1094, Trop Neuroepidemiol, Limoges, France
[2] Univ Limoges, UMR S 1094, Inst Neuroepidemiol & Trop Neurol, Trop Neuroepidemiol,CNRS FR GEIST 3503, F-87000 Limoges, France
[3] CHU Limoges, Ctr Epidemiol Biostat & Methodol Rech, Limoges, France
[4] IRCCS Ist Ric Farmacol Mario Negri, Dipartimento Neurosci, Lab Malattie Neurol, Milan, Italy
[5] CHU Lyon, Hop Neurol P Wertheimer, Electromyog & Pathol Neuromuscularies, Lyon, France
[6] CHU Limoges, Serv Neurol, Ctr Expert SLA, Limoges, France
[7] CHU Clermont Ferrand, Hop Gabriel Montpied, Serv Neurol, Ctr Expert SLA, Clermont Ferrand, France
[8] CHU Pellegrin, Serv Neurol, Ctr Expert SLA, Bordeaux, France
[9] CHU Toulouse Purpan, Ctr Expert SLA, Unite Neurophysiol Clin, Toulouse, France
[10] CHU St Etienne, Hop Nord, Serv Neurol, Ctr Expert SLA, St Etienne, France
[11] Univ Bari Aldo Moro, Dept Basic Med Sci Neurosci & Sense Organs, Bari, Italy
[12] Univ Bari Aldo Moro, Dept Clin Res Neurol, Unit Neurodegenerat Dis, Pia Fdn Cardinale G Panico, Lecce, Italy