1. The National Hospital for Neurology and Neurosurgery, Queen Square, London & Sobell Department of Motor Neuroscience, UCL Institute of Neurology, London, United Kingdom of Great Britain and Northern Ireland;
2. The Institute of Psychology and Health and Society, University of Liverpool, Liverpool, United Kingdom of Great Britain and Northern Ireland;
3. Faculty of Health, Social Care and Education, Kingston University and St Georges University of London, London, United Kingdom of Great Britain and Northern Ireland