1. Centre for Intellectual Disability and Mental Health GGZ Drenthe Assen The Netherlands
2. Department of Child and Adolescent Psychiatry University of Groningen, University Medical Centre Groningen Groningen The Netherlands
3. Accare University Centre for Child and Adolescent Psychiatry Groningen The Netherlands
4. Department of Clinical Psychology and Experimental Psychopathology University of Groningen Groningen The Netherlands
5. General Practitioners Research Institute Groningen The Netherlands