Acknowledgements
This study was supported by grants from the Norwegian Research Council (Grant 142592), the Norwegian Ministry of Child and Family Affairs, and the Faculty of Social Sciences at the University of Oslo. Additional support was provided by the Fonds de Recherche sur la Société et la Culture to Frank Vitaro and by the Fonds de Recherche enanté du Québec via a senior research fellowship to Mara Brendgen. These funding bodies were not involved in the collection, analysis or interpretation of data used in the current study, or in the preparation of the written report. The authors wish to acknowledge the work of interviewers who gathered data for use in this report and the children, parents and teachers who gave their time and attention to our study.