1. Royal College of Psychiatrists, Centre for Quality Improvement, 21 Prescot Street, London, E1 8BB, UK
2. Institute of Mental Health, University of Nottingham, Nottingham, UK
3. Suffolk Access and Treatment Team, Norfolk and Suffolk NHS Foundation Trust, Ipswich, UK
4. Centre for Quality Improvement, Royal College of Psychiatrists, London, UK
5. Oxleas NHS Foundation Trust, Dartford, UK
6. Centre for Psychiatry, Imperial College London, London, UK