[1] Queen Mary Univ London, Blizard Inst, Barts & London Sch Med & Dent, London, England
[2] UCL, Inst Neurol, London, England
[3] UCL, Natl Hosp Neurol & Neurosurg, London, England
[4] UCL, Royal Hallamshire Hosp, London, England
[5] UCL, Queen Sq Multiple Sclerosis Ctr, NMR Res Unit, Dept Neuroinflammat,UCL Inst Neurol, London, England
[6] London Sch Hyg & Trop Med, Dept Med Stat, London, England
[7] Univ Basel Hosp, Basel, Switzerland
[8] Univ Gothenburg, Gothenburg, Sweden