1. Euan MacDonald Centre for Motor Neurone Disease Research, University of Edinburgh, Edinburgh, UK,
2. Anne Rowling Regenerative Neurology Clinic, University of Edinburgh, Edinburgh, UK,
3. Department of Clinical Neurosciences, NHS Lothian, Edinburgh, UK,
4. Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK,
5. Clinical Audit Research and Evaluation for Motor Neurone Disease, Scotland, UK, and