1. Health Services and Population Research Department, King’s Health Economics, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK,
2. Portman Clinic, Tavistock and Portman NHS Foundation Trust, London, UK,
3. Research Department of Clinical, Educational and Health Psychology, University College London, London, UK,
4. Tavistock Clinic, Tavistock and Portman NHS Foundation Trust, London, UK,
5. Personal Social Services Research Unit, London School of Economics and Political Science, London, UK, and
6. Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK