Published Online: November 25, 2013. doi:10.1001/jamainternmed.2013.12607.
Study concept and design: Kepka, Breen, Benard, Saraiya.
Acquisition of data: Breen.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Kepka, Breen, Benard, Saraiya.
Critical revision of the manuscript for important intellectual content: Kepka, Breen, King, Saraiya.
Statistical analysis: Kepka, Breen, King
Administrative, technical, or material support: Saraiya.
Study supervision: Kepka.
Conflict of Interest Disclosures: None reported.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the National Institutes of Health or the Centers for Disease Control and Prevention.
Additional Contributions: Helen I. Meissner, PhD, at the Office of Disease Prevention, Tobacco Regulatory Science Program, National Institutes of Health; and Katherine B. Roland, MPH, at the Cancer Surveillance Branch, Centers for Disease Control and Prevention, contributed to the design, data interpretation, and manuscript preparation of this investigation. Drs Meissner and Roland were not compensated for their contributions to this study.