Accepted for Publication: April 10, 2014.
Published Online: November 19, 2014. doi:10.1001/jamasurg.2014.863.
Study concept and design: Gajdos, Hawn, Finlayson, Henderson, Robinson.
Acquisition, analysis, or interpretation of data: Gajdos, Kile, Henderson.
Drafting of the manuscript: Gajdos, Kile, Robinson.
Critical revision of the manuscript for important intellectual content: Gajdos, Hawn, Finlayson, Henderson.
Statistical analysis: Kile, Henderson.
Administrative, technical, or material support: Gajdos, Hawn.
Study supervision: Gajdos, Hawn, Henderson, Robinson.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by Paul B. Beeson Award K23AG034632 from the National Institute on Aging (Dr Robinson). Statistical analysis for this study was supported by funds from the University of Colorado Department of Surgery and School of Medicine.
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.