Author Contributions: Ms Lasswell 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: Lasswell, Barfield, Rochat, Blackmon.
Acquisition of data: Lasswell, Barfield.
Analysis and interpretation of data: Lasswell, Barfield, Blackmon.
Drafting of the manuscript: Lasswell, Barfield, Blackmon.
Critical revision of the manuscript for important intellectual content: Lasswell, Barfield, Rochat.
Statistical analysis: Lasswell.
Obtained funding: Barfield.
Administrative, technical, or material support: Barfield.
Study supervision: Barfield, Rochat.
Financial Disclosures: None reported.
Funding/Support: Ms Lasswell was supported in part by an appointment to the Research Participation Program at the Centers for Disease Control and Prevention administered by the Oak Ridge Institute for Science and Education (ORISE) through an interagency agreement between the US Department of Energy and the CDC.
Role of the Sponsor: ORISE had no role in the design and conduct of the study; in the collection, management, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the CDC.
Previous Presentation: Preliminary results were presented at the 15th Annual Maternal and Child Health Epidemiology Conference; December 11, 2009; Tampa, Florida.
Additional Contributions: We acknowledge Danielle Barradas, PhD, Mary D. Brantley, MPH, MT(ASP)SI, David Goodman, PhD, and Marianne Zotti, DrPH, RN, Maternal Child Health Epidemiology Team, Applied Sciences Branch, Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, CDC, for their careful review and classification of manuscripts as second coders for data extraction; Gail Bang, MLIS, IRRES, CDC Public Health Library and Information Center, and Barbara Abu-Zeid, MLIS, Emory University Health Sciences Center Library, for design of database search strategies; and Nicole Crepaz, PhD, Prevention Research Branch, Division of HIV/AIDS Prevention, CDC, for review of methods and statistics. No compensation was received for these contributions.