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Article History

Received: 4 August 2024

Accepted: 26 January 2026

First Online: 10 June 2026

Declarations

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: The protocol was approved by the Approval Committee of the Helsinki University Hospital Ethics board (#HUS/1485/2023).The adolescents will receive oral and written information about the study. Informed consent from the adolescent will be obtained digitally after the self-evaluation at baseline. While all adolescents are asked to fill in the survey forms, only the digital survey data of those adolescents who provide informed consent to participate in the study will be stored and used for research purposes. For those whose age at baseline is below 15 years, a caretaker’s informed consent is necessary; data without caretaker’s consent will not be stored. The consenting adolescents will have an option to decline and withdraw from the study at any point afterwards by sending an SMS, by email, or by using a link on the study site.The caretakers and therapists receive both oral and written information about the study. They will provide informed consent digitally before being provided the digital survey. Separate consent to the caretaker survey will be requested from all caretakers, independent of the age of the adolescent.

: Tarja Koskinen is an accredited IPT-A, IPC-A psychotherapy trainer (IPT-A, IPC-A). Max Karukivi, Tarja Koskinen, Klaus Ranta and Jari Lahti are accredited CBT psychotherapy trainers. Klaus Ranta, Mauri Marttunen and Outi Linnaranta have received author subventions from Duodecim for articles and as editors or authors in a book on IPT-A and IPC-A (published in 9/2023) and a book on Psychiatry. The other authors report no financial relationships with competing interests.‎.