Author Contributions: Dr Jones 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: Jones, Paulozzi.
Acquisition of data: Jones.
Analysis and interpretation of data: Jones, Mack, Paulozzi.
Drafting of the manuscript: Jones.
Critical revision of the manuscript for important intellectual content: Jones, Mack, Paulozzi.
Statistical analysis: Jones.
Administrative, technical, or material support: Mack, Paulozzi.
Study supervision: Jones.
Conflict of Interest: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: The US Centers for Disease Control and Prevention funded this study.
Role of the Sponsor: The US Centers for Disease Control and Prevention supported the staff responsible for 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.
Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the official position of the US Centers for Disease Control and Prevention.