1. Department of Primary Care and Public Health, Imperial College London, London, UK
2. NIHR Applied Research Collaboration Northwest London, London, UK
3. Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
4. South London and Maudsley NHS Foundation Trust, London, UK
5. NIHR Applied Research Collaboration South London, London, UK
6. NIHR Applied Research Collaboration North Thames, London, UK
7. Department of Applied Health Research, University College London (UCL), London, UK
8. Institute of Cancer Research, Sutton, UK