Corresponding Author: Alexander K. Smith, MD, MS, MPH, Division of Geriatrics,
University of California, San Francisco, 4150 Clement St (181G), San Francisco, CA 94121
Accepted for Publication: April 16, 2013.
Published Online: July 8, 2013. doi:10.1001/jamainternmed.2013.8738.
Study concept and design: Smith, Covinsky.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Smith.
Critical revision of the manuscript for important intellectual content: All
Statistical analysis: Smith, Miao, Boscardin.
Obtained funding: Smith, Covinsky.
Administrative, technical, and material support: Smith.
Study supervision: Smith.
Conflict of Interest Disclosures: None
Funding/Support: Dr Smith was supported by the
National Center for Research Resources University of California, San
Francisco–Clinical and Translational Science Institute (UL1 RR024131) and a
Paul Beeson Career Development Award in Aging (1K23AG040772-01A1). Drs Walter and Covinsky were
supported by K-24 grants from the National Institute on
Aging (K24AG029812 and 1K24AG041180-01, respectively).
Role of the Sponsor: The National Institutes of Health had 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.