[1] UCL, Inst Neurol, Dept Neurodegenerat Dis, Dementia Res Ctr, London, England
[2] UCL, Dept Mol Neurosci, Inst Neurol, London, Sweden
[3] UCL, Inst Neurol, MRC, Prion Unit,Dept Neurodegenerat Dis, London, England
[4] UCL, Ctr Med Image Comp, London, England
[5] London Sch Hyg & Trop Med, Dept Med Stat, London, England
[6] Uman Diagnost, Umea, Sweden
[7] Univ Gothenburg, Sahlgrenska Acad, Inst Neurosci & Physiol, Clin Neurochem Lab,Dept Psyschiat & Neurochem, Gothenburg, Sweden