Accepted for Publication: September 19, 2012.
Published Online: February 18, 2013. doi:10.1001/jamapediatrics.2013.751
Author Contributions: Dr Magge 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: Magge, Sprinz, Adams, and Meyers. Acquisition of data: Sprinz, Adams, and Meyers. Analysis and interpretation of data: Magge, Sprinz, Adams, Drainoni, and Meyers. Drafting of the manuscript: Magge, Sprinz, and Adams. Critical revision of the manuscript for important intellectual content: Magge, Drainoni, and Meyers. Statistical analysis: Magge. Administrative, technical, and material support: Magge, Sprinz, Adams, and Drainoni. Study supervision: Adams, Drainoni, and Meyers.
Conflict of Interest Disclosures: None reported.
Funding/Support: Dr Magge's work was supported by the National Research Service Award grant 6 T32 HP10263 from the National Institutes of Health.
Additional Contributions: We thank Sean Palfrey, MD, for his efforts to preserve zinc protoporphyrin screening at Boston Medical Center; Julianne Nassif at the Massachusetts State Laboratory for providing zinc protoporphyrin data; Howard Cabral, PhD, for his analytic support; Asif Alvi, MD, MS, for his preliminary review of the data; and Tracey Wilkinson, MD, Caroline Kistin, MD, Webb Long, MD, and Neil Gupta, MD, for their thoughtful manuscript review.