1. Institute of Neurology, UCL, Queen Square, London, UK
2. Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
3. Huntington’s Disease Centre, UCL, Queen Square, London, UK
4. Department of Clinical Neurosciences, Royal Free Campus UCL Institute of Neurology, UK
5. Wellcome Centre for Human Neuroimaging, UCL, Queen Square, London, UK
6. Institute of Cognitive Neuroscience, UCL, Queen Square, London, UK
7. Department of Movement Disorders, UCL, Queen Square, London, UK
8. UCL Dementia Research Centre, Queen Square, London, UK