1. Department of Neurology and Neurological Sciences, Stanford School of Medicine, Stanford, CA, USA
2. Neuroscience axis, CHU de Québec-Université Laval, Québec, QC, Canada
3. Department of Medicine, Faculty of Medicine, Université Laval, Quebec, QC, Canada
4. Service des Neurosciences, Université de Mons, Mons, Belgique
5. Unité des Ataxies Cérébelleuses, Service de Neurologie, CHU-Charleroi, Charleroi, Belgique