Study concept and design: Klevens, Sadowski, Kee.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Klevens.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Klevens, Lokey.
Obtained funding: Klevens, Sadowski.
Administrative, technical, or material support: Sadowski, Garcia, Lokey.
Study supervision: Sadowski, Kee, Garcia.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This study was funded by the US Centers for Disease Control and Prevention (CDC), National Center for Injury Prevention and Control, Division of Violence Prevention.
Role of the Funder/Sponsor: The CDC, National Center for Injury Prevention and Control, Division of Violence Prevention participated in the design and conduct of the study; management, analysis, and interpretation of the data; and preparation, review, and 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.
Additional Contributions: There are additional contributions listed at the end of the reference 4 article.
Trial Registration: clinicaltrials.gov Identifier: NCT00526994