[1] Kings Coll Hosp London, Dept Neurol, London, England
[2] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Basic & Clin Neurosci, London, England
[3] Aarhus Univ, Aarhus, Denmark
[4] Univ Toronto, Univ Hlth Network, Ellen & Martin Prosserman Ctr Neuromuscular Dis, Toronto, ON, Canada
[5] Univ Belgrade, Univ Clin Ctr Serbia, Neurol Clin, Fac Med, Belgrade, Serbia
[6] Med Univ Lublin, Dept Neurol, Lublin, Poland
[7] Takeda Dev Ctr Amer Inc, Cambridge, MA USA