1. Department of Educational and Family Sciences, Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
2. Viveon
3. Department of Inclusive and Special Needs Education and Child Care, University of Groningen, Groningen, the Netherlands
4. Academische Werkplaats EMB
5. Academische Werkplaats Sociale relaties en gehechtheid
6. Academische Werkplaats Leven met een verstandelijke beperking, Tranzo, Tilburg School of Social and Behavioral Sciences, Tilburg University, Tilburg, the Netherlands
7. Department of Public Health and Primary Care, Leiden University Medical Center, the Netherlands