Author Contributions: Dr Berry 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: Berry, Toomey, Zaslavsky, Jha, Nakamura, Feng, Shulman, Chiang, Hall, Schuster.
Acquisition of data: Berry, Nakamura, Shulman, Hall, Schuster.
Analysis and interpretation of data: Berry, Toomey, Zaslavsky, Jha, Nakamura, Klein, Feng, Shulman, Chiang, Kaplan, Hall, Schuster.
Drafting of the manuscript: Berry, Schuster.
Critical revision of the manuscript for important intellectual content: Berry, Toomey, Zaslavsky, Jha, Nakamura, Klein, Feng, Shulman, Chiang, Kaplan, Hall, Schuster.
Statistical analysis: Berry, Zaslavsky, Klein, Feng, Hall.
Obtained funding: Berry, Toomey, Jha, Schuster.
Administrative, technical, or material support: Feng, Shulman, Kaplan.
Study supervision: Schuster.
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: Funding was provided by the Agency for Healthcare Research and Quality (U18 HS020513, Principal Investigator: Dr Schuster). Dr Berry was supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (K23 HD058092).
Role of the Sponsor: The funders 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.
This article was corrected for errors on February 6, 2013.