1. Faculty of Psychology and Educational Sciences, Department of Special Education, University of Leuven, Vesaliusstraat 2, B-3000 Leuven, Belgium
2. School Guidance Center, Hendrik-I-lei 164, B-1800 Vilvoorde, Belgium;
3. Faculty of Social Sciences, Leiden University, Postbus 9555, NL-2300 RB Leiden, the Netherlands
4. Faculty of Psychology and Educational Sciences, University of Leuven, Vesaliusstraat 2, B-3000, Leuven, Belgium