Published Online: September 2, 2013. doi:10.1001/jamainternmed.2013.8519.
Acquisition of data: Seabury.
Analysis and interpretation of data: Seabury, Chandra, Jena.
Drafting of the manuscript: Seabury, Chandra, Jena.
Critical revision of the manuscript for important intellectual content: Seabury, Chandra, Jena.
Statistical analysis: Seabury, Chandra.
Study supervision: Seabury, Jena.
Conflict of Interest Disclosures: None reported.
Funding/Support: Dr Chandra was supported by grant P01 AG19783-02 from the National Institute of Aging.
Role of the Sponsor: The design, conduct, analysis, interpretation, and presentation of the data are the responsibility of the investigators, with no involvement from the funding sources.