1. Centre of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray
2. Donders Institute for Brain, Cognition and Behaviour, Radboud University
3. Department of Human Genetics, Radboud University Medical Centre, Nijmegen
4. Inforsa, Hilversum
5. Zuidwester Healthcare Institution for People with Intellectual Disabilities, Middelharnis
6. Department of Internal Medicine, Erasmus University Medical Center
7. Center for Adults With Rare Genetic Syndromes, Erasmus University Medical Center, Rotterdam, The Netherlands