Accepted for Publication: August 1, 2012.
Published Online: December 31, 2012. doi:10.1001/2013.jamapediatrics.282
Author Contributions:Study concept and design: Levy, Walker, Romano, and Whitehead. Acquisition of data: Levy, Langer, Romano, Christie, Youssef, DuPen, and Ballard. Analysis and interpretation of data: Levy, Langer, Walker, Romano, Youssef, DuPen, Labus, Welsh, Feld, and Whitehead. Drafting of themanuscript: Levy, Langer, Romano, Youssef, DuPen, Ballard, and Labus. Criticalrevision of the manuscript for important intellectual content: Levy, Langer, Walker, Romano, Christie, Labus, Welsh, Feld, and Whitehead. Statistical analysis: Labus and Welsh. Obtained funding: Levy, Walker, and Romano. Administrative, technical, and material support: Christie, DuPen, Ballard, and Feld. Study supervision: Levy, Langer, and Romano.
Conflict of Interest Disclosures: None reported.