Author Contributions: Dr Santry had full access
to all of the data in the study and takes responsibility for the integrity
of the data and the accuracy of the data analysis.
Study concept and design: Santry, Gillen, Lauderdale.
Acquisition of data: Santry.
Analysis and interpretation of data: Santry,
Drafting of the manuscript: Santry.
Critical revision of the manuscript for important
intellectual content: Gillen, Lauderdale.
Statistical analysis: Santry, Gillen.
Obtained funding: Santry.
Administrative, technical, or material support:
Study supervision: Lauderdale.
Financial Disclosures: None reported.
Funding/Support: Dr Santry was supported by
a fellowship from the Robert Wood Johnson Clinical Scholars Program, a pilot
project grant (P30 AG-12857-08) from the National Institute on Aging to the
Center on Aging at the University of Chicago, and the Dr Paul Jordan Research
Fund in Surgery at the University of Chicago.
Role of the Sponsor: Neither the Robert Wood
Johnson Foundation nor the National Institute on Aging played any role in
the design and conduct of the study; collection, management, analysis, and
interpretation of the data; and preparation, review, or approval of the manuscript.
Disclaimer: The authors of this article are
responsible for its contents. No statement in this article should be construed
as an official position of the Agency for Healthcare Research and Quality
or the US Department of Health and Human Services.
Previous Presentations: Abstract of preliminary
data presented at the 11th Annual Charles Huggins Research Conference, Chicago,
Ill, May 15, 2004. Abstract presented at the Chicago Surgical Society, Chicago,
Ill, March 3, 2005.