Study concept and design: Vandrey, J. Raber, Douglass, Bonn-Miller.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Vandrey, J. Raber, M. Raber, Bonn-Miller.
Critical revision of the manuscript for important intellectual content: Vandrey, J. Raber, Douglass, Miller, Bonn-Miller.
Statistical analysis: Bonn-Miller.
Obtained funding: Vandrey.
Administrative, technical, or material support: All authors.
Study supervision: Vandrey, J. Raber, Douglass.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Bonn-Miller reported receiving personal fees and nonfinancial support from Tilray (Division of Privateer Holdings) and travel reimbursement from Americans for Safe Access. No other disclosures were reported.
Funding/Support: This project was funded by Johns Hopkins University School of Medicine except for the cost of analytical testing, which was covered by Werc Shop Laboratories.
Role of the Funder/Sponsor: Neither Johns Hopkins University nor Werc Shop Laboratories played a role in the design or conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication.
Correction: This article was corrected on June 25, 2015, to fix the overlabeled and underlabeled descriptors used incorrectly in the text and in Table 1.