Anthony David is Professor of Cognitive Neuropsychiatry at the Institute of Psychiatry, King's College, London, and Honorary Consultant Psychiatrist at the South London and Maudsley NHS Foundation Trust, London, UK.

Simon Fleminger is Consultant Neuropsychiatrist responsible for the Brain Injury Unit at the South London and Maudsley NHS Foundation Trust, London, UK.

Michael Kopelman is Professor of Neuropsychiatry at the Institute of Psychiatry, King's College, London, and Consultant Neuropsychiatrist, St Thomas' Hospital, London, UK.

Simon Lovestone is Professor of Old Age Psychiatry at the NIHR Biomedical Research Centre for Mental Health; MRC Centre for Neurodegeneration Research; Departments of Psychological Medicine and Neuroscience, Institute of Psychiatry, King's College, London, UK.

John Mellers is Consultant Neuropsychiatrist at the South London and Maudsley NHS Foundation Trust, London, UK.