1. Department of Psychology and Newnham College, University of Cambridge, Cambridge, United Kingdom
2. Centre for Brain and Cognitive Development, Birkbeck, University of London, London, United Kingdom
3. The London Down Syndrome (LonDownS) Consortium, London, United Kingdom
4. Queen Square Institute of Neurology, Department of Neurodegenerative Disease, University College London, London, United Kingdom
5. Division of Life Science, Hong Kong University of Science and Technology, Hong Kong SAR, People’s Republic of China
6. Institute of Psychiatry, Psychology, and Neuroscience, Department of Forensic and Neurodevelopmental Sciences, King’s College London, London, United Kingdom
7. Department of Psychology, University of York, York, United Kingdom
8. UK Dementia Research Institute at University College London, University College London Institute of Neurology, Department of Neurodegenerative Disease, University College London, London, United Kingdom
9. Reta Lila Weston Institute, Queen Square Institute of Neurology, University College London, London, United Kingdom
10. National Institute for Health Research University College London Hospitals Biomedical Research Centre, London, United Kingdom
11. South London and the Maudsley National Health Service Foundation Trust, London, United Kingdom