Accepted for Publication: April 11, 2011.
Author Contributions: Dr Hack had full access to all 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: Hack, Forrest, Taylor, and Drotar. Acquisition of data: Hack, Drotar, and Andreias. Analysis and interpretation of data: Hack, Forrest, Schluchter, Taylor, Drotar, Holmbeck, and Andreias. Drafting of the manuscript: Hack. Critical revision of the manuscript for important intellectual content: Hack, Forrest, Schluchter, Taylor, Drotar, Holmbeck, and Andreias. Statistical analysis: Hack, Schluchter, Drotar, Holmbeck, and Andreias. Obtained funding: Hack and Taylor. Administrative, technical, and material support: Hack, Forrest, and Andreias. Study supervision: Hack and Taylor.
Financial Disclosure: None reported.
Funding/Support: This study was supported by grants R01 HD 39756, M01 RR000, and ULI RR024989 from the National Institutes of Health.
Additional Contributions: Miriam Curran, BS, coordinated the project and participated in the interview of the parents; Terese Reid, Jennifer Eppich, MA, and Mary Morrow Tlucak, MA, all research assistants, administered tests and questionnaires; Lydia Cartar, MA, participated in the initial data management and analysis; and Bonnie Tarantino, BS, and Alpher Torres provided clerical assistance.