Author Contributions: Dr Winkelmayer had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Winkelmayer, Willett, Curhan.
Acquisition of data: Stampfer, Willett, Curhan.
Analysis and interpretation of data: Winkelmayer, Stampfer, Willett, Curhan.
Drafting of the manuscript: Winkelmayer.
Critical revision of the manuscript for important intellectual content: Winkelmayer, Stampfer, Willett, Curhan.
Statistical analysis: Winkelmayer, Willett, Curhan.
Obtained funding: Willett, Curhan.
Administrative, technical, or material support: Stampfer, Willett, Curhan.
Study supervision: Curhan.
Financial Disclosures: None reported.
Funding/Support: This study was funded by National Institutes of Health grants DK52866, DK66574, CA87969, and CA050385. Dr Winkelmayer is a 2004 T. Franklin Williams Scholar in Geriatric Nephrology and a recipient of the American Society of Nephrology-ASP-Junior Development Award in Geriatric Nephrology, jointly sponsored by the Atlantic Philanthropies, the American Society of Nephrology, the John A. Hartford Foundation, and the Association of Subspecialty Professors. He is also supported by an American Heart Association Scientist Development grant (0535232N).
Role of the Sponsors: None of the funding organizations had any role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.