Published Online: March 2, 2015. doi:10.1001/jamapediatrics.2014.3574.
Study concept and design: Both authors.
Acquisition, analysis, or interpretation of data: Wallace.
Drafting of the manuscript: Wallace.
Critical revision of the manuscript for important intellectual content: Both authors.
Statistical analysis: Both authors.
Study supervision: Sommers.
Conflict of Interest Disclosures: Dr Sommers currently serves as a part-time advisor in the Office of the Assistant Secretary for Planning and Evaluation at the US Department of Health and Human Services.
Funding/Support: This material is based on work supported by grant DGE 1144152 from the National Science Foundation Graduate Research Fellowship (Mr Wallace).
Role of the Funder/Sponsor: The funder 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: This research letter does not represent the views of the US Department of Health and Human Services.