1. South London and Maudsley NHS Foundation Trust London UK
2. Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience King's College London London UK
3. Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience King's College London London UK
4. NIHR South London and Maudsley Biomedical Research Centre London UK
5. Health Service and Population Research Department, Institute of Psychiatry, Psychology and Neuroscience King's College London London UK
6. Emotion & Development Branch, National Institute of Mental Health National Institutes of Health Bethesda MD USA