Author Contributions: Dr Buchanan 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: Buchanan, Heard, Burbach, Wilson, Dart.
Acquisition of data: Buchanan, Heard, Burbach, Wilson.
Analysis and interpretation of data: Buchanan, Heard, Burbach.
Drafting of the manuscript: Buchanan, Burbach.
Critical revision of the manuscript for important intellectual content: Buchanan, Heard, Burbach, Wilson, Dart.
Statistical analysis: Buchanan, Heard, Burbach.
Obtained funding: Buchanan, Burbach, Dart.
Administrative, technical, or material support: Buchanan, Burbach, Wilson.
Study supervision: Dart.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This work was supported by an intramural research grant from the Rocky Mountain Poison and Drug Center. Dr Heard was supported by award K08DA020573 from the National Institute on Drug Abuse.
Role of the Sponsor: The sponsor had no role in 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 content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute on Drug Abuse or the National Institutes of Health.
Additional Contributions: We thank Vanessa Simmons, BA, Department of Public Health, Denver, Colorado, for specimen analysis and Brooke Bender, MSPH, Denver Health and Hospital Authority, Denver, for study coordination. Neither received compensation.