1. Department of General Practice, Intellectual Disability Medicine Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
2. Middin Rijswijk The Netherlands
3. Medical Department ASVZ, Care and Service Centre for People with Intellectual Disabilities Sliedrecht The Netherlands
4. Department of General Practice Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
5. Department of Sleep and Cognition Netherlands Institute for Neuroscience Amsterdam The Netherlands
6. Department of Integrative Neurophysiology, Centre for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam Vrije Universiteit Amsterdam The Netherlands
7. Amsterdam UMC, Vrije Universiteit, and GGZ inGeest, Dept. of Psychiatry Amsterdam Public Health Research Illnstitute Amsterdam The Netherlands
8. Ipse de Bruggen Zoetermeer The Netherlands