Published Online: March 12, 2012. doi:10.1001/archinternmed.2012.212
Author Contributions:Study concept and design: Doty, Fryer, and Audet. Acquisition of data: Doty. Analysis and interpretation of data: Doty, Fryer, and Audet. Drafting of the manuscript: Doty, Fryer, and Audet. Critical revision of the manuscript for important intellectual content: Doty, Fryer, and Audet. Statistical analysis: Doty and Fryer. Administrative, technical, and material support: Fryer. Study supervision: Doty and Audet.
Financial Disclosure: None reported.
Funding/Support: This study was supported by the Commonwealth Fund.