Accepted for Publication: April 25, 2014.
Published Online: June 10, 2014. doi:10.1001/jamainternmed.2014.2534.
Study concept and design: Albrecht, Liu, Baumgarten, Rattinger, Smith, Gambert, Gottlieb, Zuckerman.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Albrecht, Liu, Langenberg
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Albrecht, Liu, Baumgarten, Langenberg, Gambert, Zuckerman.
Obtained funding: Rattinger, Smith, Zuckerman.
Administrative, technical, or material support: Rattinger, Smith, Zuckerman.
Study supervision: Smith, Zuckerman.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by National Institutes of Health grant R21 AG042768-01 (Zuckerman, principal investigator). Dr Albrecht is supported by National Institutes of Health grant T32AG000262-14.
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; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Previous Presentation: This study was presented as a poster at the AcademyHealth Annual Research Meeting; June 10, 2014; San Diego, California.