1 Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK; St Mark's Hospital, London, UK. Electronic address: calum.moulton@kcl.ac.uk.
2 Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; South London and Maudsley NHS Foundation Trust, London, UK.