1 School of Health and Psychological Sciences, City, University of London, London EC1V 0HB, UK. Electronic address: steven.gillard@city.ac.uk.
2 School of Health and Psychological Sciences, City, University of London, London EC1V 0HB, UK.
3 Department of Primary Care and Public Health, Brighton and Sussex Medical School, Brighton, UK.
4 Joint Faculty of Health, Social Care and Education, Kingston University London and St George's, University of London, London, UK.
5 Population Health Research Institute, St George's, University of London, London, UK.
6 King's Health Economics, King's College London, London, UK.
7 Centre for Applied Research in Health, University of Huddersfield, Huddersfield, UK.
8 Pragmatic Clinical Trials Unit, Queen Mary, University of London, London, UK.
9 Adult Community Mental Health Team, South West London and St George's Mental Health NHS Trust, London, UK.
10 Unit for Social and Community Psychiatry, Queen Mary University of London, London, UK.
11 Strategy and Transformation, South West London and St George's Mental Health NHS Trust, London, UK; Centre for Work and Mental Health, Nordland Hospital Trust, Bodø, Norway.
12 Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
13 Population Health Research Institute, St George's, University of London, London, UK; Institute for Social Marketing and Health, University of Stirling, Stirling, UK.