Accepted for Publication: May 31, 2012.
Published Online: November 12, 2012. doi:10.1001/jamapediatrics.2013.418
Author Contributions: Drs Profit and Pietz 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: Profit, Zupancic, Gould, Pietz, Draper, and Petersen. Acquisition of data: Profit, Zupancic, Gould, Kowalkowski, Hysong, and Petersen. Analysis and interpretation of data: Profit, Pietz, Kowalkowski, and Draper. Drafting of the manuscript: Profit, Zupancic, Gould, and Petersen. Critical revision of the manuscript for important intellectual content: Profit, Zupancic, Gould, Pietz, Kowalkowski, Draper, Hysong, and Petersen. Obtained funding: Profit, Hysong, and Petersen. Administrative, technical, and material support: Profit, Zupancic, Gould, and Petersen.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study is supported in part by grants 1 K23 HD056298 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development (Dr Profit), CD2-07-0181 from the Department of Veterans Affairs Health Services Research and Development Program (Dr Hysong), Veterans Affairs Health Services Research and Development Center of Excellence grant HFP90-20 (Drs Hysong and Petersen), and American Heart Association Established Investigator Award 0540043N (Dr Petersen).
Additional Contributions: We thank Aloka L. Patel, MD, and Rush University Medical Center (Chicago, Illinois) for granting Dr Profit a nonexclusive license to use Rush University Medical Center's exponential infant growth model for noncommercial research purposes.