Published Online: August 12, 2013. doi:10.1001/jamainternmed.2013.9270.
Study concept and design: Both authors.
Acquisition of data: Bishop.
Analysis and interpretation of data: Both authors.
Drafting of the manuscript: Ryskina.
Critical revision of the manuscript for important intellectual content: Bishop.
Statistical analysis: Ryskina.
Administrative, technical, and material support: Bishop.
Study supervision: Bishop.
Conflicts of Interest Disclosures: None reported.
Funding/Support: Dr Bishop is supported by a National Institute on Aging Career Development Award (K23AG043499) and as a Nanette Laitman Clinical Scholar in Public Health at Weill Cornell Medical College.
Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.