1. Rudd Centre for Adoption Research and Practice, School of Psychology, University of Sussex, Brighton, UK
2. Division of Psychological Medicine and Clinical Neurosciences, Cardiff University School of Medicine, Child and Adolescent Psychiatry, MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff, Wales
3. Cardiff University, School of Psychology, Cardiff, Wales
4. Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
5. Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK