Published Online: February 11, 2013. doi:10.1001/jamainternmed.2013.3812
Author Contributions:Study concept and design: LeBlanc. Acquisition of data: LeBlanc, Johnson, and Ballatore. Analysis and interpretation of data: LeBlanc, Perrin, and Hillier. Drafting of the manuscript: LeBlanc. Critical revision of the manuscript for important intellectual content: LeBlanc, Perrin, Johnson, Ballatore, and Hillier. Statistical analysis: LeBlanc and Perrin. Obtained funding: LeBlanc. Administrative, technical, and material support: Johnson and Ballatore.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was funded through Kaiser Permanente internal funding.
Additional Contributions: Jill Pope, BA, and Carol Ayres, MA, helped edit the manuscript, and Christine Wilkins helped with manuscript preparation.