Accepted for Publication: May 23, 2013.
Published Online: January 1, 2014. doi:10.1001/jamasurg.2013.5009.
Study concept and design: Warner, Borah, Schroeder, Shi, Shah.
Acquisition of data: Moriarty, Shah.
Analysis and interpretation of data: Warner, Borah, Moriarty, Schroeder, Shah.
Drafting of the manuscript: Warner, Moriarty, Shi.
Critical revision of the manuscript for important intellectual content: Warner, Borah, Moriarty, Schroeder, Shah.
Statistical analysis: Borah, Moriarty, Schroeder, Shi.
Obtained funding: Warner, Shah.
Study supervision: Warner, Shah.
Conflict of Interest Disclosures: None reported.
Funding/Support: The data analysis was supported by funds from the Mayo Foundation. Study data were obtained from the Rochester Epidemiology Project, which is supported by the National Institute on Aging of the National Institutes of Health (grant R01 AG034676).
Role of the Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.