1. LuMind IDSC Foundation Burlington Massachusetts USA
2. Department of Disability and Human Development University of Illinois Chicago Chicago Illinois USA
3. National Task Group on Intellectual Disabilities and Dementia Practices Rockport Maine USA
4. Advocate Health, Advocate Medical Group Adult Down Syndrome Center Advocate Lutheran General Hospital Family Medicine Residency Park Ridge Illinois USA
5. Waisman Center IDDRC University of Wisconsin Madison Wisconsin USA
6. Division of Developmental and Behavioral Pediatrics Cincinnati Children's Hospital Medical Center University of Cincinnati College of Medicine Cincinnati Children's Hospital Cincinnati Ohio USA
7. California Department of Developmental Services Sacramento California USA
8. Biomedical Research Institute Sant Pau Universitat Autònoma de Barcelona Barcelona Spain
9. Department of Neurology Hospital de la Santa Creu i Sant Pau Barcelona Spain
10. Departments of Neurology and Psychological & Brain Sciences Knight Alzheimer Disease Research Center Washington University St. Louis Missouri USA
11. Neurology Associates of South Jersey Lumberton New Jersey USA
12. Department of Psychology New York State Institute for Basic Research in Developmental Disabilities Island New York USA
13. MGH Neurology Research Mass General Brigham Hospital Massachusetts General Hospital Boston Massachusetts USA
14. Department of Neurology & German Center of Neurodegenerative Diseases (DZNE) e.V. Ludwig‐Maximilians University Munich Germany
15. Department of Neurology Sahgrenska University Hospital Mölndal Sweden
16. Trinity Centre for Ageing and Intellectual Disability Trinity College, University of Dublin Dublin Ireland
17. Outpatient Department Institut Jerome Lejeune Paris France
18. Department of Radiology Athinoula Martinos Center Massachusetts General Hospital Harvard Medical School Charlestown Massachusetts USA
19. Department of Pediatrics University of California Irvine Irvine California USA
20. Institute of Psychiatry Psychology and Neuroscience, Kings College London UK
21. Department of Psychiatry Cambridge Intellectual and Developmental Disabilities Research Group Cambridge University Cambridge UK
22. Institute for Stroke and Dementia Research Sahlgrenska Academy at the University of Gothenburg Molndal Sweden
23. Clinical Neurochemistry Laboratory Sahlgrenska University Hospital Molndal Sweden
24. Munich Cluster for Systems Neurology (SyNergy) Munich Germany