1. IVO Addiction Research Institute; Rotterdam the Netherlands
2. Erasmus Medical Centre; Rotterdam the Netherlands
3. NIVEL; Netherlands Institute for Health Sciences Research; Utrecht the Netherlands
4. Trimbos Institute; Utrecht The Netherlands
5. Faculty of Psychology and Educational Sciences; Open University; Heerlen the Netherlands
6. Faculty of Behavioural and Social Sciences; University of Groningen; the Netherlands
7. Tranzo; School of Social and Behavioral Sciences; Tilburg University the Netherlands