1. School of Health Sciences, University of Manchester, Manchester, UK
2. National Institute for Health Research Evaluation Trials and Studies Coordinating Centre, University of Southampton, Southampton, UK
3. Department of Health Sciences, University of Leicester, Leicester, UK
4. Department of Applied Health Research, University College London, London, UK
5. Centre for Health Economics, University of York, York, UK
6. Department of Health Policy, London School of Economics, London, UK
7. Warwick Medical School, University of Warwick, Coventry, UK