Author Contributions: Drs Schwenk and Wimsatt had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Schwenk, Wimsatt, Davis.
Acquisition of data: Schwenk, Wimsatt, Davis.
Analysis and interpretation of data: Schwenk, Wimsatt.
Drafting of the manuscript: Schwenk, Wimsatt.
Critical revision of the manuscript for important intellectual content: Schwenk, Wimsatt, Davis.
Statistical analysis: Wimsatt.
Obtained funding: Schwenk.
Administrative, technical, or material support: Schwenk, Wimsatt, Davis.
Study supervision: Schwenk.
Financial Disclosures: None reported.
Funding/Support: The Department of Family Medicine, University of Michigan.
Role of the Sponsor: The sponsor had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Previous Presentations: A limited set of preliminary data and analysis was presented at a Colloquium of the Depression Center at the University of Michigan on February 5, 2010.
Additional Contributions: Guidance in study design and concept was provided by Daniel Eisenberg, PhD; assistance in data analysis by Ananda Sen, PhD; critical review of the manuscript by Katherine T. Gold, MD; and logistical and philosophical support by James O. Woolliscroft, MD. All are affiliated with the University of Michigan, and none received compensation for their assistance.