1 Department of Applied Health Research, University College London, London WC1E 7HB, UK steve.morris@ucl.ac.uk.
2 Research Department of Primary Care and Population Health, University College London, London, UK.
3 Department of Applied Health Research, University College London, London WC1E 7HB, UK.
4 Manchester Business School, University of Manchester, Manchester, UK.
5 Division of Health and Social Care Research, School of Medicine, King's College London, London, UK.
6 King's College London Stroke Research Patients and Family Group, Division of Health and Social Care Research, School of Medicine, King's College London, London, UK.
7 Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London, UK.
8 University of Manchester Stroke and Vascular Centre, Manchester Academic Health Science Centre, Salford Royal Hospitals NHS Foundation Trust, Salford, UK.
9 Division of Health and Social Care Research, School of Medicine, King's College London, London, UK National Institute of Health Research Comprehensive Biomedical Research Centre, Guy's and St Thomas' NHS Foundation Trust and King's College London, London, UK.