1. Department of Neurology; Maastricht University Medical Center; Maastricht The Netherlands
2. Department of Clinical Genetics; Maastricht University Medical Center; Maastricht The Netherlands
3. Department of Neurology; Erasmus Medical Center Rotterdam; Rotterdam The Netherlands
4. Department of Neurology, St. Elizabeth's Medical Center; Tufts University School of Medicine; Boston MA USA
5. Department of Neurology, Rudolf Magnus Institute of Neuroscience; University Medical Center Utrecht; Utrecht The Netherlands
6. Department of Neurological Sciences, Milan University; Humanitas Clinical Institute; Rozzano Milan Italy
7. Department of Neurology; Cedars-Sinai Medical Center; Los Angeles, California USA
8. Department of Neurology; Hôpital de la Salpêtrière; Paris France
9. Department of Neurology; Catholique University of Louvain; Louvain Belgium
10. Department of Clinical Neurosciences; Neuromuscular Diseases Unit National Neurological Institute “Carlo Besta”; 3rd Neurology Unit Milan Italy
11. Department of Neurology; Toronto General Hospital; Toronto ON Canada
12. Department of Neurology, Centre for Neuromuscular Disease; National Hospital for Neurology and Neurosurgery; Queen Square London UK
13. Department of Neurology; Centre de Référence des Maladies Neuromusculaires et de la SLA; Hôpital de La Timone Marseille France
14. Department of Neurology; Academic Medical Center; Amsterdam The Netherlands
15. Department of Neurology; London Health Science Center; London ON Canada
16. Department of Neurology; Johns Hopkins School of Medicine; Baltimore MD USA
17. Department of Neurology; Spaarne Hospital; Hoofddorp The Netherlands