Author Contributions: Dr Kahn 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: Kahn, Adams, Weeks, Chrischilles, Ayanian, Potosky, Harrington, Fletcher.
Acquisition of data: Kahn, Weeks, Chrischilles, Ayanian, Harrington, Fletcher.
Analysis and interpretation of data: Kahn, Adams, Weeks, Chrischilles, Schrag, Ayanian, Kiefe, Ganz, Bhoopalam, Harrington, Fletcher.
Drafting of the manuscript: Kahn, Adams, Fletcher.
Critical revision of the manuscript for important intellectual content: Kahn, Adams, Weeks, Chrischilles, Schrag, Ayanian, Kiefe, Ganz, Bhoopalam, Potosky, Harrington, Fletcher.
Statistical analysis: Kahn, Adams, Schrag, Harrington.
Obtained funding: Kahn, Weeks, Chrischilles, Ayanian, Kiefe, Harrington, Fletcher.
Administrative, technical, or material support: Kahn, Schrag, Harrington, Fletcher.
Study supervision: Kahn.
Financial Disclosures: None reported.
Funding/Support: The Cancer Care Outcomes Research and Surveillance (CanCORS) Consortium was supported by grants from the National Cancer Institute (NCI) to the statistical coordinating center at the Dana-Farber Cancer Institute (U01 CA093344) and the primary data collection and research centers at RAND Corporation and University of California, Los Angeles (U01 CA093348); Harvard Medical School and Northern California Cancer Center (U01 CA093324); Dana-Farber Cancer Institute and Cancer Research Network (U01 CA093332); University of Alabama at Birmingham (U01 CA093329); University of Iowa (U01 CA01013); and University of North Carolina (U01 CA093326) and by a Department of Veterans Affairs grant to the Durham VA Medical Center (U01 CDA093344 [MOU] and HARQ 03-438MO-03).
Role of the Sponsor: The funding organizations had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Previous Presentations: An abstract of this study was presented at the AcademyHealth Annual Research Meeting; June 8, 2008; Washington, DC; and at the American Society of Clinical Oncology Annual Meeting; June 2, 2008; Chicago, Illinois.
Additional Contributions: Afshin Rastegar, MS, RAND Corporation, conducted statistical analyses using salary support from the CanCORS Consortium grant from the NCI (U01 CA093348) for this work at RAND.