Author Contributions: Dr Davis 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: Davis, Waller, Allison, Bassali, Boyle, Gower.
Acquisition of data: Davis, Allison, Bassali, Boyle.
Analysis and interpretation of data: Davis, Pollock, Waller, Allison, Dennis, Bassali, Meléndez, Gower.
Drafting of the manuscript: Davis, Pollock, Waller, Dennis, Meléndez.
Critical revision of the manuscript for important intellectual content: Davis, Pollock, Waller, Allison, Dennis, Bassali, Boyle, Gower.
Statistical analysis: Davis, Pollock, Waller.
Obtained funding: Davis.
Administrative, technical, or material support: Davis, Pollock, Allison, Meléndez, Boyle, Gower.
Study supervision: Davis, Allison, Bassali, Boyle.
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: This work was supported by grants R01 DK060692, R01 HL087923, and P30 DK056336 from the National Institutes of Health and grant PR2006-0125 from the Salvador de Madariaga Program of the Spanish Ministry of Education and Science.
Role of the Sponsor: Funding agencies had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Additional Contributions: We thank the study participants and staff who made this research possible, Catrina Creech, BA, for coordinating the study, Rachel Elam, ScM, for assistance with manuscript preparation, and Bernard Gutin, PhD, for contributions to study design; each received salary support for this work at the Department of Pediatrics, Medical College of Georgia. Dr Gutin is now with the Department of Nutrition, University of North Carolina, Chapel Hill. We also thank David Allison, PhD, and John Dawson, PhD, of the School of Public Health, University of Alabama at Birmingham, who provided consultation on statistical analyses. Neither received compensation.