Author Contributions: Dr Tongren 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: Tongren, Pelletier.
Acquisition of data: Tongren, Sites, Zwicker, Pelletier.
Analysis and interpretation of data: Tongren, Sites, Pelletier.
Drafting of the manuscript: Tongren, Pelletier.
Critical revision of the manuscript for important intellectual content: Tongren, Sites, Zwicker, Pelletier.
Statistical analysis: Tongren.
Administrative, technical, or material support: Pelletier.
Study supervision: Sites, Pelletier.
Financial Disclosures: None reported.
Funding/Support: There was no external funding for this study. The work was conducted by employees of the Centers for Disease Control and Prevention and the Maine Department of Health and Human Services.
Role of the Sponsor: The Centers for Disease Control and Prevention reviewed and approved the manuscript. They had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation of the manuscript.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.