Accepted for Publication: January 13, 2011.
Author Contributions: All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Collett, Cunningham, and Speltz. Acquisition of data: Collett, Berg, Cunningham, and Speltz. Analysis and interpretation of data: Collett, Starr, Kartin, Heike, and Speltz. Drafting of the manuscript: Collett and Berg. Critical revision of the manuscript for important intellectual content: Collett, Starr, Kartin, Heike, Berg, Cunningham, and Speltz. Statistical analysis: Collett and Starr. Obtained funding: Collett, Cunningham, and Speltz. Administrative, technical, and material support: Collett, Heike, Berg, Cunningham, and Speltz. Study supervision: Collett and Speltz.
Financial Disclosure: None reported.
Funding/Support: This publication was made possible, in part, by grant 1 R01 HD046565 from the National Institute of Child Health and Human Development (Dr Speltz) and grant 1 UL1 RR025014 from the National Center for Research Resources, components of the National Institutes of Health.
Disclaimer: The contents of this publication are solely the responsibility of the authors and do not necessarily represent the official view of the National Institute of Child Health and Human Development, the National Center for Research Resources, and the National Institutes of Health.
Additional Contributions: Darcy King, ARNP, Bay Sittler, ARNP, Eileen Twohy, BA, and Sharman Conner, MA, assisted with recruitment and Tristen Nash, BS, Antigone Wolfram-Aduan, BS, and Kristen Daniels, MILS, assisted with data entry and analyses. We thank all the families who took part in the study for their time and participation.