1. Centre for Trials Research, Cardiff University, Cardiff, UK
2. Centre for Development, Evaluation, Complexity and Implementation in Public Health Improvement (DECIPHer), Cardiff University, Cardiff, UK
3. School of Healthcare Sciences, Cardiff University, Cardiff, UK
4. Swansea Centre for Health Economics, Swansea University, Swansea, UK
5. Faculty of Life Sciences and Education, University of South Wales, Pontypridd, UK
6. School of Social Sciences, Cardiff University, Cardiff, UK