University College London - Centre for Outcomes Research and Effectiveness (CORE), University College London - Centre for Outcomes Research and Effectiveness (CORE), University of California, Los Angeles (UCLA) - Departments of Psychiatry and Biobehavioral Sciences, University College London - Centre for Outcomes Research and Effectiveness (CORE), University College London - Centre for Outcomes Research and Effectiveness (CORE), University College London - Department of Social Science, University of Pennsylvania, University of York - Department of Health Sciences, Vanderbilt University - Department of Psychology, University of Southampton - Primary Care and Population Science, University of Exeter - School of Psychology, University of Bristol, University of Bristol, University of Exeter, University of Bristol, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of Bristol, University College London, University College London - Division of Psychiatry and University College London - Centre for Outcomes Research and Effectiveness (CORE)

University of Bristol - Bristol Medical School, University of York - Department of Health Sciences, University of Bristol - Centre for Academic Mental Health, University College London - Division of Psychiatry, University of York - Department of Health Sciences, University of Bristol - Department of Population Health Sciences and University of Bradford

University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, Keele University - School of Medicine, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of York - Department of Health Sciences, University of Leeds - School of Medicine, University of York - Department of Health Sciences, Swansea University - Patient and Public Involvement Representative, University of York - Department of Health Sciences, University of Leeds - School of Medicine, Tees, Esk and Wear Valleys NHS Foundation Trust, Age UK, University of York - Department of Health Sciences, University of Leeds - School of Medicine, The University of Manchester - Division of Nursing, Midwifery and Social Work, University of York - Department of Health Sciences, University of Leeds - School of Medicine, National Institute for Health and Care Research and University of York - Department of Health Sciences