1. Department of Neurology and Alzheimer Research CenterUniversity of Groningen, University Medical Center GroningenGroningenThe Netherlands
2. Laboratory of Neurochemistry and Behaviour, Institute Born‐Bunge, University of AntwerpWilrijkAntwerpBelgium
3. Department of NeurologyHospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau, Universitat Autonoma de BarcelonaBarcelonaSpain
4. Down Medical Center, Catalan Down Syndrome FoundationBarcelonaSpain
5. Neurological Tissue Bank—BiobancHospital Clinic Barcelona, Institut d'Investigacions Biomediques August Pi i SunyerBarcelonaSpain
6. Faculty of Health and Life Sciences, Department of Experimental and Health SciencesUniversitat Pompeu FabraBarcelonaSpain
7. Department of Neurology and Memory ClinicHospital Network Antwerp (ZNA) Middelheim and Hoge BeukenAntwerpBelgium