Author Contributions: Dr Gross 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: Gross, Krumholz, Tinetti.
Acquisition of data: Gross, McAvay.
Analysis and interpretation of data: Gross, Andersen, McAvay, Proctor, Tinetti.
Drafting of the manuscript: Gross, Andersen, Tinetti.
Critical revision of the manuscript for important intellectual content: Krumholz, McAvay, Proctor, Tinetti.
Statistical analysis: Andersen, McAvay.
Obtained funding: Gross.
Study supervision: Krumholz, Tinetti.
Financial Disclosures: None reported.
Funding/Support: Dr Gross's efforts were supported by a Beeson Career Development Award (1 K08 AG24842) and the Claude D. Pepper Older Americans Independence Center at Yale University(P30AG21342).
Role of the Sponsor: The study sponsor played no 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: This study used the linked Surveillance, Epidemiology, and End Results (SEER)-Medicare database. The interpretation and reporting of these data are the sole responsibility of the authors. We acknowledge the efforts of the Applied Research Program, National Cancer Institute; the Office of Research, Development and Information, Centers for Medicare & Medicaid Services; Information Management Services Inc; and the SEER program tumor registries in the creation of the SEER-Medicare database.