Study concept and design: Bachhuber.
Acquisition of data: Bachhuber.
Analysis and interpretation of data: Bachhuber, Cunningham.
Drafting of the manuscript: Bachhuber, Cunningham.
Critical revision of the manuscript for important intellectual content: Bachhuber, Cunningham.
Statistical analysis: Bachhuber.
Obtained funding: Cunningham.
Study supervision: Cunningham.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Cunningham’s husband was recently employed by Pfizer Pharmaceuticals and is currently employed by Quest Diagnostics. No other disclosures were reported.
Funding/Support: This study was supported by grants R34DA031066, R01DA032110, R25DA023021, and AI-51519 from the National Institutes of Health.
Role of the Sponsor: The National Institutes of Health had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.