Published Online: April 11, 2011. doi:10.1001/jama.2011.451
Author Contributions: Dr Tangri 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 Naimark, Levin, and Levey contributed equally to this article.
Study concept and design: Tangri, Djurdjev, Naimark, Levin, Levey.
Acquisition of data: Tangri, Djurdjev, Naimark, Levin, Levey.
Analysis and interpretation of data: Tangri, Stevens, Griffith, Tighiouart, Naimark, Levin, Levey.
Drafting of the manuscript: Tangri, Levey.
Critical revision of the manuscript for important intellectual content: Tangri, Stevens, Griffith, Tighiouart, Djurdjev, Naimark, Levin, Levey.
Statistical analysis: Tangri, Griffith, Tighiouart, Djurdjev.
Obtained funding: Tangri, Levey.
Administrative, technical, or material support: Tangri, Djurdjev, Naimark, Levin, Levey.
Study supervision: Stevens, Griffith, Naimark, Levin, Levey.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported by the KRESCENT postdoctoral fellowship award and William B. Schwartz Nephrology Fund. The KRESCENT award is a joint initiative of the Kidney Foundation of Canada, the Canadian Institute of Health Research, and the Canadian Society of Nephrology. Dr Naimark was supported by an operating grant from the Change Foundation of Ontario.
Role of the Sponsors: The funding organizations 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.
Additional Contributions: Daniel Schwartz and Chan Kruse (both from QxMD) provided in-kind assistance with smartphone application development. No compensation was received.