Bendiksen, Bothild, Heidi Aase, Elisabeth Svensson, Svein Friis, Anne Margrethe Myhre, Ted Reichborn-Kjennerud, and Pål Zeiner. 2014. “Impairment in Young Preschool Children With Symptoms of Attention-Deficit/Hyperactivity Disorder and Co-Occurring Oppositional Defiant Disorder and Conduct Disorder”. Scandinavian Journal of Child and Adolescent Psychiatry and Psychology 2 (3):95-105. https://tidsskrift.dk/sjcapp/article/view/17131.