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Authors
Olseth, Asgeir Røyrhus https://orcid.org/0009-0008-1213-3667
Bjørnebekk, Gunnar https://orcid.org/0000-0003-2176-7393
Keles, Serap https://orcid.org/0000-0002-1174-0667
Hagen, Kristine Amlund https://orcid.org/0000-0002-5778-2934
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Funding
Funding for this research was provided by:
NUBU - The Norwegian Center for Child Behavioral Development
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Article History
Received: 2 June 2025
Accepted: 1 January 2026
First Online: 17 January 2026
Declarations
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: This study was performed in line with the principles of the Declaration of Helsinki and approved by the Regional Committee for Medical Research Ethics South and East Norway. Informed consent wascollected from legal guardians, and the youths themselves if they were over 16 years old. Youths under 16 were informed about the study and the right to refuse participation.
: Not applicable.
: Asgeir Røyrhus Olseth and Kristine Amlund Hagen are employed at Norwegian Center for Child Behavioral Development (NCCBD), the organization that were responsible for the implementation of Functional Family Therapy in Norway. Gunnar Bjørnebekk and Serap Keles declare they have no conflict of interest.
