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Article History

Received: 6 February 2025

Accepted: 30 June 2025

First Online: 26 August 2025

Declarations

:

: The study was approved by the Regional Ethics Committee of Stockholm, Sweden (dnr. 2017/2435-31/5, 2019–06362, 2023-03871-02) and was carried out in compliance with the Declaration of Helsinki. All participants received written and oral information about the study and were given the opportunity to ask questions. Written informed consent to participate in the study was obtained from all participants.

: Not applicable.

: The authors declare that they have no competing interests related to this work to disclose. However, for transparency, they disclose that: Four of the authors (T.L., S.Bu., L.W., T.H.) have been directly involved in developing the PT program under study and/or in the training of new IPSA therapists (who later delivered IPSA to several comparison groups). Two of the authors (S.Bu., L.W.) are IPSA therapists and have in this role treated the majority of participants in the study. T.H. receives royalties for treatment manuals from Hogrefe and textbooks from Studentlitteratur. S.Bö. has in the last 3 years acted as an author, consultant, or lecturer for Medice, Takeda, and LinusBio. S.Bö. receives royalties for textbooks and diagnostic tools from Hogrefe, UTB, Ernst Reinhardt, Kohlhammer, and Liber. S.Bö. is partner NeuroSupportSolutions International AB. M.F. receives royalties for two books on parenting from Natur & Kultur. LW receives royalties for a book on ADHD from Gothia Kompetens. T.L. receives royalties for a treatment manual from Hogrefe and parts of the contents of this manuscript appeared in her doctoral thesis [].