1. Child and Adolescent Mental Health Centre, Mental Health Services–Capital Region of Denmark, Copenhagen, Denmark
2. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
3. Danish Centre for Health Economics, Department of Public Health, University of Southern Denmark, Odense
4. Musculoskeletal Statistics Unit, Parker Institute, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
5. Research Unit of Rheumatology, Department of Clinical Research, University of Southern Denmark, Odense University Hospital, Odense, Denmark
6. Division of Child and Adolescent Psychiatry, Department of Psychiatry, Lausanne University Hospital, Lausanne, Switzerland
7. Department for Child and Adolescent Psychiatry, Mental Health Services in the Region of Southern Denmark, Odense, Denmark
8. Department of Clinical Research, University of Southern Denmark, Odense, Denmark
9. Research Center at the Department for Child- and Adolescent Psychiatry, Aarhus University Hospital, Skejby, Denmark
10. Institute of Clinical Medicine, Aarhus University, Aarhus, Denmark
11. Centre for the Psychological Treatment of Children and Adolescents, Department of Psychology and Behavioural Sciences, Aarhus School of Business and Social Sciences, Aarhus University, Aarhus, Denmark
12. Centre for Child and Adolescent Mental Health, Oslo, Norway
13. Centre for Child and Youth Mental Health and Child Welfare, The Arctic University of Norway, North Norway (RKBU North), Tromsø, Denmark
14. Anxiety and Mood Disorders Program, Yale Child Study Center, Yale University School of Medicine, New Haven, Connecticut
15. Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Department of Psychiatry and Molecular Medicine, Hempstead, New York
16. Department of Psychiatry, The Zucker Hillside Hospital, Glen Oaks, New York
17. Center for Psychiatric Neuroscience, Feinstein Institute for Medical Research, Manhasset, New York
18. Department of Child and Adolescent Psychiatry, Charité Universitätsmedizin, Berlin, Germany