1. Department of Neurology and Laboratory of Neuroscience, Istituto Auxologico Italiano IRCCS, Milano, Italy
2. Department of Pathophysiology and Transplantation, “Dino Ferrari” Center, Università degli Studi di Milano, Milan, Italy
3. Centre de Reference SLA, CHU Tours, and UMR 1253, iBRAIN, Université de Tours, INSERM, Tours, France
4. Department of Neurology, Columbia University, New York, NY, USA
5. Montreal Neurological Institute-Hospital, Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
6. Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA