Submitted for Publication: July 16, 2014; final revision received October 14, 2014; accepted November 12, 2014.
Published Online: January 2, 2015. doi:10.1001/jamaoto.2014.3341.
Study concept and design: Liang, Friedman.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: Ruiz, Jensen, Friedman.
Statistical analysis: Liang, Ruiz, Jensen.
Administrative, technical, or material support: Liang, Ruiz, Jensen.
Study supervision: Friedman.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported in part by National Institutes of Health (NIH)/National Center For Research Resources, Colorado, Clinical and Translational Sciences Institute grant No. UL1 RR025780.
Role of the Funder/Sponsor: The funding source had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: The contents are the authors’ sole responsibility and do not necessarily represent the official view of the NIH.