Acknowledgments
We would like to thank the children, adolescents, and teachers at the participating schools; and Grav, Åssiden, Kongsgårdsmoen, Hennummarka, Lierbyen, and Tranby for their time and cooperation during data collection. We also thank head of the Neuropsychiatric unit at Vestre Viken Health Care Trust, child psychiatrist Anne-Lene Friis Søhoel for facilitating the study and for valuable input during data analyses and preparation of this manuscript. Thanks to librarians Ellen Bjørnstad, Oslo University Hospital, and Gro Heidi Råmunddal, Vestre Viken HF, for contributing with literature searches.