1 Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK. Electronic address: lauren.carson@kcl.ac.uk.
2 National Institute for Health Research Maudsley Biomedical Research Centre, South London and Maudsley National Health Service Foundation Trust, London, UK.
3 Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK; National Institute for Health Research Maudsley Biomedical Research Centre, South London and Maudsley National Health Service Foundation Trust, London, UK.