1. Regional Centre for Child and Youth Mental Health and Child Welfare (RKBU), Department of Mental Health, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
2. Department of Child and Adolescent Psychiatry, St. Olav University Hospital, Trondheim, Norway
3. Department for Child and Adolescent Psychiatry, Aarhus University Hospital, Aarhus, Denmark
4. Psychology Services Limited, London, UK
5. Department of Psychology, Reykjavik University, Reykjavik, Iceland