[1] UCL Queen Sq Inst Neurol, Ctr Neuromuscular Dis, London, England
[2] Guys & St Thomas NHS Fdn Trust, Dept Hematol, London, England
[3] Natl Hosp Neurol & Neurosurg, UCLH NHS Fdn Trust, Dept Neuropathol, London, England
[4] UCL Queen Sq Inst Neurol, Dept Clin & Movement Neurosci, London, England
[5] Univ Coll London Hosp NHS Fdn Trust, Dept Histopathol, London, England
[6] UCL Queen Sq Inst Neurol, Dept Neurodegenerat Dis, London, England
[7] Cheltenham Gen Hosp, Dept Rheumatol, Cheltenham, England
[8] UCLH NHS Fdn Trust, Dept Clin Haematol, London, England
[9] Guys & St Thomas NHS Fdn Trust, Dept Clin Neurophysiol, London, England
[10] Natl Hosp Neurol & Neurosurg, UCLH NHS Fdn Trust, Dept Neuroradiol, London, England
[11] Gloucestershire Hosp NHS Fdn Trust, Dept Neurol, Gloucester, England