Submitted for Publication: September 16, 2011; final revision received November 26, 2011; accepted January 18, 2012.
Author Contributions: Drs Bradley, Galland, and Dawes and Prof Taylor 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: Galland, Taylor, and Dawes. Acquisition of data: Bakker and Tan. Analysis and interpretation of data: Bradley, Galland, Bakker, Gray, Taylor, and Dawes. Drafting of the manuscript: Bradley, Galland, and Dawes. Critical revision of the manuscript for important intellectual content: Bakker, Tan, Gray, Taylor, and Dawes. Statistical expertise: Gray. Obtained funding: Galland and Tan. Administrative, technical, and material support: Bakker, Tan, and Taylor. Study supervision: Galland and Dawes.
Financial Disclosure: None reported.
Funding/Support: This study was supported by a strategic development grant from the Dunedin School of Medicine and a University of Otago Research Grant.
Additional Contributions: Carmen Lobb, Phoebe Cleland, and Rachel Sayers assisted with research. We thank the children and their parents/guardians who participated in this study.