Author Contributions: Dr Lee 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: Lee, Santoli, Messonnier, Sabin, Rusinak, Lett, Lieu.
Acquisition of data: Lee, Hannan, Rusinak.
Analysis and interpretation of data: Lee, Santoli, Sabin, Gay, Lett.
Drafting of the manuscript: Lee, Santoli, Lieu.
Critical revision of the manuscript for important intellectual content: Lee, Santoli, Hannan, Messonnier, Sabin, Rusinak, Gay, Lett, Lieu.
Statistical analysis: Lee.
Obtained funding: Messonnier, Lieu.
Administrative, technical, or material support: Hannan, Messonnier, Rusinak, Gay.
Study supervision: Lee, Rusinak, Lieu.
Financial Disclosures: None reported.
Funding/Support: This study was funded by grant 1U01IP000029-01 from the Centers for Disease Control and Prevention, National Immunization Program. Dr Lee was supported by grant K-08 HS013908-01 A1 from the Agency for Healthcare Research and Quality.
Role of the Sponsor: The Centers for Disease Control and Prevention participated in the design and conduct of the study, in the interpretation of the data, and in the review and approval of the final manuscript. The Agency for Healthcare Research and Quality had no role in the design and conduct of the study, in the collection, analysis, and interpretation of the data, or in the preparation, review, or approval of the manuscript.
Additional Contributions: We thank all the state and city immunization program managers who participated in the study. We also thank Lance Rodewald, MD, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, for his advice and input on this study. Dr Rodewald did not receive any compensation for his contribution.