1 Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK.
2 Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; National Psychosis Unit, South London and Maudsley NHS Foundation Trust, UK.
3 Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK. Electronic address: Trudie.chalder@kcl.ac.uk.