1. Østfold Hospital Trust, Neuropsychiatric Unit, Child and Adolescent Psychiatry, Fredrikstad, Norway.
2. National Resource Center for ADHD, Tourettes' Syndrome and Narcolepsy, Oslo, Norway.
3. The Norwegian University of Science and Technology (NTNU), Institute of Psychology Trondheim, Norway.
4. Innlandet Hospital Trust, Division of Mental Health, Brumunddal, Norway.