Published Online: May 20, 2013. doi: 10.1001/jamainternmed.2013.1040
Study concept and design: Linos, Wehner, and Chren.
Acquisition of data: Chren.
Analysis and interpretation of data: Linos, Wehner, Frosch, Walter, and Chren.
Drafting of the manuscript: Linos.
Critical revision of the manuscript for important intellectual content: Linos, Wehner, Frosch, Walter, and Chren.
Statistical analysis: Linos.
Obtained funding: Linos and Chren.
Administrative, technical, and material support: Linos and Wehner.
Study supervision: Linos and Chren.
Conflict of Interest Disclosures: None reported.
Additional Contributions: Amy J. Markowitz, JD, provided editorial assistance; Sarah Stuart, BA, assisted with data management; and John Boscardin, PhD, and Rupa Parvataneni, BA, assisted with statistical analysis.