1. MRC Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, England
2. Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, England
3. National Prion Clinic, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, London, England
4. MRC Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, England3National Prion Clinic, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, London, England