Study concept and design: Prescott.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Prescott.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Prescott, Iwashyna.
Obtained funding: Iwashyna.
Study supervision: Iwashyna.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported by grants T32 HL007749, R01 AG0030155, R21 AG044752, and U01 AG09740 from the National Institutes of Health and grant IIR 11-109 from the Department of Veterans Affairs Health Services Research & Development Service. The Health and Retirement Study is funded by the National Institute on Aging and performed at the Institute for Social Research, University of Michigan.
Role of Funder/Sponsor: The National Institutes of Health and the Department of Veterans Affairs Health Services Research & Development Service 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.
Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the Department of Veterans Affairs or the US government.
Additional Contributions: We appreciate the expert programming of Ryan McCammon, MS, and Vanessa Dickerman, MS, at the University of Michigan, Ann Arbor. They were not compensated for their contributions besides salary.