1 Department of Psychological Medicine, London SE5 8AF, UK. Electronic address: kevin.ariyo@kcl.ac.uk.
2 Department of Health Service and Population Research, London SE5 8AF, UK.
3 Steve Gilbert Consulting, Sutton Coldfield, UK.
4 Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK.