Published Online: May 4, 2013. doi:10.1001/jama.2013.4208
Author Contributions: Dr Foster 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. Drs Mitsnefes and Laskin contributed equally to the study.
Study concept and design: Mitsnefes, Laskin, Foster.
Acquisition of data: Mitsnefes, Laskin.
Analysis and interpretation of data: Mitsnefes, Laskin, Dahhou, Zhang, Foster.
Drafting of the manuscript: Mitsnefes, Laskin, Foster.
Critical revision of the manuscript for important intellectual content: Mitsnefes, Laskin, Dahhou, Zhang, Foster.
Statistical analysis: Dahhou, Zhang, Foster.
Obtained funding: Mitsnefes, Foster.
Administrative, technical, or material support: Laskin, Foster.
Study supervision: Mitsnefes, Foster.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Laskin is a site principal investigator for studies sponsored by Amgen and Genzyme but does not receive any funding from these companies. No other disclosures were reported.
Funding/Support: Dr Mitsnefes is supported by the National Institutes of Health (R01DK07695, K24DK090070, and U01DK-03-012). Dr Laskin is supported by a Career Development Award in Comparative Effectiveness Research (1KM1CA156715-01). Dr Foster, a member of the McGill University Health Centre Research Institute (supported in part by the Fonds de la recherche en santé du Québec [FRSQ]), received salary support from the FRSQ. This work was supported in part by Health Resources and Services Administration contract 234-2005-370011C. Data were supplied by the USRDS.
Role of the Sponsor: The funding agencies had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: The content is the sole responsibility of the authors alone and does not necessarily reflect the views or policies of the Department of Health and Human Services or the United States government.