1. Department of Regional Health Research, University of Southern Denmark, Odense C, Denmark
2. Child and Adolescent Psychiatric Services Southern Jutland, Aabenraa, Denmark
3. National Centre for Register-based Research, Business and Social Sciences, Aarhus University, Aarhus, Denmark
4. Department of Clinical Medicine, Health and Medical Sciences, University of Copenhagen, Copenhagen N, Denmark
5. Center for Child and Adolescent Psychiatry, Mental Health Services of the Capital Region, Glostrup, Denmark
6. Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA
7. Child Study Center, Yale University School of Medicine, New Haven, CT, USA