1. Department of Health Services Research and Management, University of London, London WC1E 7HU, UK
2. Department of Psychiatry, Imperial College London, London W12 0NN, UK
3. Department of Psychosocial and Psychoanalytic Studies, University of Essex, Essex CO4 3SQ, UK
4. Devon Partnership NHS Trust, Exeter EX2 5AF, UK
5. Norfolk and Suffolk NHS Foundation Trust, Norwich NR6 5BE, UK
6. East London NHS Foundation Trust, London E1 8DE, UK