Author Contributions: Dr de Boer 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: de Boer, Himmelfarb.
Acquisition of data: de Boer, Rue.
Analysis and interpretation of data: de Boer, Rue, Hall, Heagerty, Weiss, Himmelfarb.
Drafting of the manuscript: de Boer, Hall, Himmelfarb.
Critical revision of the manuscript for important intellectual content: de Boer, Rue, Hall, Heagerty, Weiss, Himmelfarb.
Statistical analysis: Rue, Hall, Heagerty.
Obtained funding: de Boer.
Administrative, technical, or material support: de Boer, Himmelfarb.
Study supervision: de Boer, Weiss.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Himmelfarb reported that all honoraria and consulting fees from serving on the Shire Scientific Advisory Board on Outcomes Studies in Hemodialysis Patients and the Nephrion/Cytopheryx Medical Advisory Board are donated to the Kidney Research Institute at the University of Washington; money is paid to his institution (University of Washington) for his consulting work for Genzyme, Lilly, and Thrasos. No other authors reported disclosures.
Funding/Support: This publication was made possible by grant 5KL2RR025015 from the National Center for Research Resources, grant UL1RR025014 from the National Institutes of Health, grants 1R01DK087726 and 1R01DK088762 from the National Institute of Diabetes and Digestive and Kidney Diseases, and funding from the Satellite Healthcare's Norman S. Coplon Extramural Grant Program.
Role of the Sponsors: The funding organizations were not involved in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Disclaimer: The findings and conclusions in this article are solely the responsibility of the authors and do not necessarily represent the official view of Satellite Healthcare, the National Center for Research Resources, the National Institute of Diabetes and Digestive and Kidney Diseases, or the National Institutes of Health.