1. Health Sciences - Methodology Research Group, School of Community Based Medicine, The University of Manchester, Jean McFarlane Building, Manchester, UK,
2. National Primary Care Research and Development Centre, The University of Manchester, Williamson Building, Manchester, UK
3. Ataxia UK, Lincoln House, Kennington Park, London, UK
4. Department of Neurology, Hope Hospital, Salford Royal NHS Foundation Trust, Salford, UK
5. Health Sciences - Methodology Research Group, School of Community Based Medicine, The University of Manchester, Jean McFarlane Building, Manchester, UK