1. School of Life and Health Sciences, Aston Brain Centre, Aston University, Aston Triangle; Birmingham B4 7ET United Kingdom
2. Regional Neuromuscular Service, University Hospitals Birmingham; Birmingham United Kingdom
3. Reference Centre for Neuromuscular Diseases and ALS, Centre Hospitalier Universitaire La Timone; Marseille France
4. Aix-Marseille University, Inserm, GMGF; Marseille France