1. Department of Special Education, Ghent University, Belgium
2. Psychiatric Centre Dr. Guislain, Ghent, Belgium
3. Radboud University, Nijmegen, The Netherlands
4. Faculty of Education, Health and Social Work,University College Ghent, Belgium
5. Huize Tordale, Belgium
6. Parenting and Special Education Research Unit,University of Leuven, Belgium
7. Stichting Arduin,Middelburg, The Netherlands