1 Department of Psychological Medicine, King's College London, London SE5 8AF, UK; Institute of Psychiatry, Psychology & Neuroscience, ESRC Centre for Society and Mental Health, King's College London, London SE5 8AF, UK; South London & Maudsley NHS Trust, London, UK. Electronic address: jayati.das-munshi@kcl.ac.uk.
2 Department of Health Services & Population Research, King's College London, London SE5 8AF, UK.