1. Department of Psychology, University of Edinburgh, Edinburgh, UK,
2. Euan MacDonald Centre for Motor Neurone Disease Research, Royal Infirmary of Edinburgh, Edinburgh, UK,
3. Anne Rowling Regenerative Neurology Clinic, Royal Infirmary of Edinburgh, Edinburgh, UK,
4. Alzheimer Scotland Dementia Research Centre, University of Edinburgh, Edinburgh, UK,
5. Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King’s College London, London, UK, and
6. Academic Unit of Neurology, Trinity College Dublin, Dublin, Ireland