1. Neurological Diseases Laboratory; Institute of Hospitalization and Scientific Care-Mario Negri Institute; Milan Italy
2. Neurological Clinic, University of Bari; Bari Italy
3. ALS Center, Rita Levi Montalcini Department of Neuroscience, University of Turin; Turin Italy
4. NEMO Clinical Center, Serena Onlus Foundation, Niguarda Ca' Granda Hospital; Milan Italy
5. Tropical Neuroepidemiology; National Institute of Health and Medical Research, University of Limoges; Limoges France
6. Preston Motor Neurone Disease Centre, Royal Preston Hospital; Preston United Kingdom
7. Trinity College Institute of Neurosciences, Beaumont Hospital; Dublin Ireland
8. Clinic of Neurology, Clinical Center of Serbia, School of Medicine; Belgrade Serbia
9. Department of Neuroscience; University of Genoa; Genoa Italy
10. Civil Hospital of Brescia; Brescia Italy
11. Neurological Division; Gallarate Hospital; Legnano Italy
12. IRCCS San Raffaele Hospital; Milan Italy
13. San Gerardo Hospital; Monza Italy
14. Hospital of Lodi Province; Lodi Italy