Published Online: May 28, 2014. doi:10.1001/jamapsychiatry.2014.469.
Study concept and design: Steiner, Schiltz, Bernstein, Stoecker, Bogerts.
Acquisition, analysis, or interpretation of data: Steiner, Teegen, Schiltz, Stoecker.
Drafting of the manuscript: Steiner, Teegen, Schiltz, Bernstein.
Critical revision of the manuscript for important intellectual content: Steiner, Schiltz, Stoecker, Bogerts.
Statistical analysis: Schiltz.
Administrative, technical, or material support: Teegen, Schiltz, Stoecker, Bogerts.
Study supervision: Steiner, Bernstein, Stoecker.
Conflict of Interest Disclosures: Drs Teegen and Stoecker are full-time employees of and hold stock in EUROIMMUN AG. No other disclosures were reported.
Additional Contributions: We are very grateful to Henrik Dobrowolny, Dipl-Ing (Department of Psychiatry, University of Magdeburg), for his skillful assistance in database management and statistical analysis.