1. Sant Pau Memory Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau, Universitat Autònoma de Barcelona , Barcelona 08025 , Spain
2. Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED) , Madrid 28031 , Spain
3. Women’s Brain Project , Guntershausen 8357 , Switzerland
4. Barcelona Down Medical Center, Fundació Catalana Síndrome de Down , Barcelona 08029 , Spain
5. Multidisciplinary Sleep Unit, Hospital de la Santa Creu i Sant Pau , Barcelona 08041 , Spain
6. Hospital del Mar , Barcelona 08003 , Spain
7. Nuclear Medicine Department, Hospital de la Santa Creu i Sant Pau , Barcelona 08041 , Spain
8. Department of Psychiatry, NYU Grossman School of Medicine , New York, NY 10016 , USA
9. Clinical Research Support Unit, Bellvitge Biomedical Research Institute (IDIBELL), Department of Clinical Pharmacology, University of Barcelona , Barcelona 08908 , Spain
10. Institute for Neurosciences of Montpellier, Institute for Regenerative Medicine and Biotherapy, Université de Montpellier, CHU de Montpellier, INSERM , Montpellier 34295 , France
11. Department of Psychiatry, Cambridge Intellectual and Developmental Disabilities Research Group, University of Cambridge , Douglas House, Cambridge CB2 8AH , United Kingdom
12. Cambridgeshire & Peterborough NHS Foundation Trust, Fulbourn Hospital , Cambridge CB21 5EF , United Kingdom
13. Department of Psychiatry and Neurochemistry, University of Gothenburg , Möndal 40530 , Sweden
14. Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital , Mölndal 40530 , Sweden
15. UK Dementia Research Institute, University College London , London WC1E 6BT , United Kingdom
16. Department of Neurodegenerative Disease, University College London Institute of Neurology , London WC1E 6BT , United Kingdom
17. Hong Kong Center for Neurodegenerative Diseases , Clear Water Bay, Hong Kong 1512-1518 , China