Matt Butler MBChB MRes MRCPsych Wellcome Trust Doctoral Clinical Research Fellow Institute of Psychiatry, Psychology and Neuroscience, and Specialist Registrar in Psychiatry, King's College London and South London and Maudsley NHS Foundation Trust

Jonathan P Rogers MA MB BChir MRCP MRCPsych NIHR Academic Clinical Fellow, Institute of Psychiatry, Psychology and Neuroscience, King¿s College London, and South London and Maudsley NHS Foundation Trust, London, UK

Timothy RJ Nicholson MBBS BSc MSc PhD MRCP MRCPsych Clinical Lecturer & NIHR Clinician Scientist, Institute of Psychiatry Psychology & Neuroscience, King¿s College London, and Honorary Consultant Neuropsychiatrist, South London & Maudsley NHS Foundation Trust, London, UK