1. Division of Psychology and Mental Health, School of Health Sciences, University of Manchester, Manchester, UK,
2. Greater Manchester Mental Health NHS Foundation Trust, Prestwich, Manchester, UK,
3. Division of Population Health, Health Services Research and Primary Care, School of Health Sciences, University of Manchester, Manchester, UK,
4. Lancashire Care NHS Foundation Trust, Preston, Lancashire, UK, and
5. Merseycare NHS Foundation Trust, Liverpool, UK