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Article History

Received: 29 April 2025

Accepted: 22 May 2026

First Online: 29 May 2026

Declarations

:

: This study was conducted according to the principles of the Declaration of Helsinki [ ]. Ethical approval for the study protocol was given by the Freie Universität Berlin Ethical Review Board (161/2017) for the trial in Germany and by the Swedish Ethical Review Authority (2020 − 00261) for the trial in Sweden. Both studies were also reviewed and approved by the WHO Research Ethics Review Committee (ERC.0003321). All participants provided electronic informed consent.

: The authors alone are responsible for the views expressed in this article and they do not necessarily represent the views, decisions or policies of the institutions with which they are affiliated.

: The authors declare no competing interests.

: The STRENGTHS consortium members in alphabetical order are: Ceren Acarturk 10 , Aemal Akhtar 11 , Ibrahim Akinçi 12 , Mhd Salem Alkneme 1,3 , Ammar Alsaod 1 , Ahmed Bawaneh 13 , Martha Bird 14 , Felicity L. Brown 15,16 , Richard Bryant 11 , Sebastian Burchert 1,2 , Pim Cuijpers 5,6 , Anne M. de Graaff 4,5 , Annelieke Drogendijk 17 , Daniela Fuhr 18 , Jonas Maria Hessling 1 , Zeynep Ilkkursun 10 , Mark J.D. Jordans 15,16 , Christine Knaevelsrud 1,2 , Gülşah Kurt 10 , David McDaid 19 , Saara Martinmäki 17 , Cansu Mirzanlı 12 , Trudy Mooren 17 , Naser Morina 20 , A-La Park 19 , Monique Pfaltz 21 , Bayard Roberts 18 , Matthis Schick 20 , Ulrich Schnyder 20 , Marit Sijbrandij 5 , Egbert Sondorp 22 , Julia Spaaij 22 , Frederik Steen 15 , Karine Taha 23 , Peter Ventevogel 24 , Claire Whitney 13 , Nana Wiedemann 14 , Aniek Woodward 22 1 Department of Education and Psychology, Division of Clinical Psychological Intervention, Freie Universität Berlin, Berlin, Germany 2 German Center for Mental Health (DZPG), partner site Berlin-Potsdam, Berlin, Germany 3 Department of Systemic Psychotherapy, Berlin School of Psychology, Berlin, Germany 5 Department of Clinical, Neuro and Developmental Psychology, WHO Collaborating Center for Research and Dissemination of Psychological Interventions, Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands 6 Babeș-Bolyai University, International Institute for Psychotherapy, Cluj-Napoca, Romania 10 Koc University, Istanbul, Turkey 11 School of Psychology, University of New South Wales, Sydney, NSW, Australia 12 Refugees and Asylum Seekers Assistance and Solidarity Association, Istanbul, Turkey 13 International Medical Corps, Amman, Jordan 14 International Federation of Red Cross and Red Crescent Societies, Copenhagen, Denmark 15 Research and Development Department, War Child Holland, Amsterdam, The Netherlands 16 Amsterdam Institute of Social Science Research, University of Amsterdam, Amsterdam, the Netherlands 17 ARQ International, Amsterdam, The Netherlands 18 London School of Hygiene and Tropical Medicine, London, UK 19 London School of Economics and Political Science, London, UK 20 University of Zurich, Zurich, Switzerland 21 Mid Sweden University, Sundsvall, Sweden 22 KIT Royal Tropical Institute, Amsterdam, The Netherlands 23 War Child Lebanon, Beirut, Lebanon 24 United Nations High Commissioner for Refugees, Geneva, Switzerland