Submitted for Publication: July 11, 2012; final revision received December 21, 2012; accepted December 25, 2012.
Published Online: July 3, 2013. doi:10.1001/jamapsychiatry.2013.19.
Study concept and design: Wunderink, Wiersma, Sytema, Nienhuis.
Acquisition of data: Nieboer, Nienhuis.
Analysis and interpretation of data: Wunderink, Nieboer, Sytema.
Drafting of the manuscript: Wunderink, Sytema.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Wunderink, Sytema.
Obtained funding: Wunderink, Wiersma, Nienhuis.
Administrative, technical, and material support: Nieboer.
Study supervision: Wiersma.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded by unconditional grants from Janssen-Cilag Netherlands and Friesland Mental Health Services, Leeuwarden, the Netherlands.
Role of the Sponsors: The sponsors had no further role in any part of the study or preparation of the manuscript.
Additional Contributions: The following mental health care services within the Netherlands participated in data acquisition: Dimence (Deventer), GGNet (Warnsveld), GGZ Drenthe (Assen), GGZ Friesland (Leeuwarden), Lentis (Groningen), Mediant (Enschede), University Psychiatric Center/University Medical Center Groningen (Groningen), and Yulius (Dordrecht).