1. Department of Forensic and Neurodevelopmental SciencesInstitute of Psychiatry, Psychology & Neuroscience, Kings College LondonLondonUK
2. Division of PsychiatryUniversity Collee LondonLondonUK
3. The London Down Syndrome Consortium (LonDownS)UK
4. South London and Maudsley NHS Foundation TrustLondonUK
5. DichterbijCenter for Intellectual DisabilitiesGennepthe Netherlands
6. Department of Primary and Community CareRadboud University Medical CenterNijmegenthe Netherlands
7. Memory Unit, Department of NeurologyHospital de la Santa Creu i Sant Pau‐ Biomedical Research Institute Sant Pau‐Universitat Autònoma de BarcelonaBarcelonaSpain
8. Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, CIBERNEDSpain
9. Department of NeurologyLudwig‐Maximilians‐Universität MünchenMunichGermany
10. Barcelona Down Medical Center, Fundació Catalana de Síndrome de DownBarcelonaSpain
11. Department of Molecular NeuroscienceUCL Institute of NeurologyLondonUK
12. Reta Lila Weston Institute, Institute of Neurology, University College LondonLondonUK
13. German Center for Neurodegenerative Diseases (DZNE) site MunichMunichGermany
14. Institut Jérôme LejeuneParisFrance
15. Centre for Clinical Brain Sciences, Dementia Prevention Research Group, University of Edinburgh
16. Department of EpidemiologyErasmus Medical CentreRotterdamthe Netherlands
17. Cambridge Intellectual & Developmental Disabilities Research GroupDepartment of PsychiatryUniversity of CambridgeCambridgeUK
18. Cambridgeshire & Peterborough NHS Foundation Trust (CBFT), Fulbourn HospitalCambridgeUK
19. UK Dementia Research Institute at UCLLondonUK
20. Institute of Neuroscience and PhysiologyDepartment of Psychiatry and Neurochemistrythe Sahlgrenska Academy at the University of GothenburgMölndalSweden
21. Clinical Neurochemistry Laboratory, Sahlgrenska University HospitalMölndalSweden