1. Neuromuscular Unit, Department of Neurology Hospital Universitario y Politécnico la Fe Valencia Spain
2. Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Valencia Spain
3. Department of Medicine Universitat de València Valencia Spain
4. Motor Neuron Unit, Neurology Department Bellvitge Hospital‐IDIBELL Barcelona Spain
5. Neuromuscular Unit, Neuropediatric Department Institut de Recerca Pediàtrica Hospital Sant Joan de Déu Barcelona Spain
6. Center for the Biomedical Research on Rare Diseases (CIBERER), ISCIII Madrid Spain
7. Neuromuscular Unit, Neurology Department Hospital Clínico Universitario Virgen de la Arrixaca Murcia Spain
8. ALS and Neuromuscular Unit, Neurology Department Hospital Universitario Basurto—OSI Bilbao Bilbao Spain
9. Physical Medicine and Rehabilitation Department Hospital Sant Joan de Deu Barcelona Spain
10. Department of Applied Statistics and Operational Research and Quality Universitat Politècnica de València Valencia Spain