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Article History

Received: 20 November 2025

Accepted: 23 January 2026

First Online: 18 February 2026

Declarations

:

: This research was approved by the Ethics Committee of the Medical School Berlin (22/10/2025; MSB-2025/313).

: Not applicable – This protocol contains no individual person’s data. The authors will obtain consent from the participants to publish anonymized individual patient data.

: Important protocol modifications will be reported in the trial paper.

:

: All regulatory requirements relating to data protection will be met. Subsequent to the completion and publication of all planned publications, the trials’ de-identified data, accompanied by a data dictionary, will be stored and made accessible via the Research Data Centre of the Leibniz Institute for Psychology.

: In line with DFG form 2.00–1/21, we will publish our project results for the purpose of scholarly communication in open access (directly in international, high-impact open access journals or open access platforms, or in addition to commercial publication they will be included in subject-specific or institutional electronic repositories). Results will be published in accordance with CONSORT statement for reporting of randomized controlled trials (sub-study 1) and JARS-Qual (sub-study 2). In addition, a workshop for psychotherapist’s training will be designed and given at psychotherapy training events in order to disseminate the treatment concept in the field. A senior citizen organization will be asked to summarize the findings in user-friendly language and ensure that the information is accessible to a public audience and the target population.

: The authors declare no competing interests.