1. Bessy Benejam, Down Medical Centre (CMD), Catalan Down Syndrome Foundation (FCSD), Barcelona, Spain;
2. Juan Fortea, Down Medical Centre (CMD), Catalan Down Syndrome Foundation (FCSD), Barcelona, Spain; Memory Unit, Neurology Department, Hospital de la Santa Creu I Sant Pau, Biomedical Research Institute Sant Pau, Universitat Autònoma de Barcelona;
3. Rafael Molina-López, Clinical Research, Catalan Down Syndrome Foundation, Barcelona, Spain; and
4. Sebastià Videla, Clinical Research, Catalan Down Syndrome Foundation (FCSD), Barcelona, Spain; Department of Experimental and Health Sciences, Faculty of Health and Life Sciences, Universitat Pompeu Fabra.