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, Brookhart.
Acquisition of data: Winkelmayer, Brookhart.
Analysis and interpretation of data: Winkelmayer, Liu, Brookhart.
Drafting of the manuscript: Winkelmayer, Brookhart.
Critical revision of the manuscript for important intellectual content: Winkelmayer, Liu, Brookhart.
Statistical analysis: Winkelmayer, Liu, Brookhart.
Obtained funding: Winkelmayer, Brookhart.
Administrative, technical, or material support: Brookhart.
Study supervision: Winkelmayer, Brookhart.
Financial Disclosures: Dr Winkelmayer reports receiving a Norman S. Coplon Extramural Research Program Award from Satellite Healthcare Inc, and investigator-initiated grant support from Amgen, Fresenius Medical Care, and GlaxoSmithKline. He has participated, without receiving an honorarium, in advisory boards of Amgen, Roche, Genzyme, and Fresenius. Dr Brookhart reports receiving investigator-initiated grant support from Amgen. He has participated, without receiving an honorarium, in an advisory board of Amgen. Dr Liu reports no disclosures.
Funding/Support: Dr Winkelmayer is supported by Scientist Development Grant 0535232N from the American Heart Association. Dr Brookhart is supported by career development award AG-027400 from the National Institute on Aging.
Role of the Sponsor: This work was not funded by any external agencies or companies.
Disclaimer: Data reported herein were supplied by the United States Renal Data System (USRDS). Interpretation and reporting of these data are the responsibility of the authors and in no way should be seen as official policy or interpretation of the US government.