Submitted for Publication: April 17, 2014; final revision received September 3, 2014; accepted September 29, 2014.
Published Online: January 21, 2015. doi:10.1001/jamapsychiatry.2014.2637.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: van den Berg, de Bont, van der Vleugel, Van Minnen, van der Gaag.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: van den Berg, de Bont, Van Minnen, van der Gaag.
Obtained funding: van den Berg, van der Gaag.
Administrative, technical, or material support: All authors.
Study supervision: de Roos, de Jongh, Van Minnen, van der Gaag.
Conflict of Interest Disclosures: Mr van den Berg and Dr van der Gaag reported receiving income for published books or book chapters about psychotic disorders and for training of postdoctoral professionals in the treatment of psychotic disorders. Ms de Roos reported receiving income for training of postdoctoral professionals in eye movement desensitization and reprocessing therapy. Dr de Jongh reported receiving income for published books or book chapters about eye movement desensitization and reprocessing therapy and for training of postdoctoral professionals in this method. Dr Van Minnen reported receiving income for published books or book chapters about posttraumatic stress disorder and for training of postdoctoral professionals in prolonged exposure. No other disclosures were reported.
Funding/Support: This study was funded by the Dutch support foundation Stichting tot Steun Vereniging voor Christelijke Verzorging van Geestes en Zenuwzieken (Dr van der Gaag).
Role of the Funder/Sponsor: The funding source had no role in the design and conduct of the study; collection, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the opinions of the authors’ institutions.
Additional Contributions: Jos Twisk, PhD (VU University) reviewed the statistical analyses. Marion Bruns, BSc, and Daniëlle Tilburgs, MSc (Parnassia Psychiatric Institute) assisted in the organization and management of the data collection, the filing, and the fact checking. We thank the following 13 mental health organizations that participated in the trial: Altrecht, Arkin, Bavo-Europoort, GGNet, Mental Health Organization Drenthe, Mental Health Organization Duin en Bollenstreek, Mental Health Organization Eindhoven, Mental Health Organization Noord-Holland Noord, Mental Health Organization Oost Brabant, Lentis, Parnassia, Pro Persona, and Yulius. We thank the Treating Trauma in Psychosis participants, therapists, research assistants, local researchers, independent specialists, advisors, involved mental health workers, and all others who contributed to this study.