1. Tayside Cancer Centre, Ninewells Hospital, NHS Tayside, Dundee, UK
2. Bristol Centre for Surgical Research, NIHR Bristol and Weston Biomedical Research Centre, Bristol University, Bristol, UK
3. Centre for Trials Research, Cardiff University, Cardiff, UK
4. Southampton Clinical Trials Unit, University of Southampton, Southampton, UK
5. Marie Curie Research Centre, Division of Population Medicine, Cardiff University, Cardiff, UK
6. Swansea Centre for Health Economics, Swansea University, Swansea, UK
7. Lay research partners, Centre for Trials Research, Cardiff University, Cardiff, UK
8. Velindre University NHS Trust, Cardiff, UK