Submitted for Publication: May 12, 2014; final revision received December 25, 2014; accepted January 1, 2015.
Published Online: April 8, 2015. doi:10.1001/jamapsychiatry.2015.1.
Study concept and design: Salmeron, Yang.
Acquisition, analysis, or interpretation of data: Hu, Salmeron, Gu, Stein, Yang.
Drafting of the manuscript: Hu, Gu, Yang.
Critical revision of the manuscript for important intellectual content: Hu, Salmeron, Stein, Yang.
Statistical analysis: Hu, Salmeron, Yang.
Obtained funding: Stein, Yang.
Administrative, technical, or material support: Salmeron, Gu, Stein.
Study supervision: Salmeron, Stein, Yang.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by the Intramural Research Program of the National Institute on Drug Abuse.
Role of the Funder/Sponsor: The Intramural Research Program of the National Institute on Drug Abuse 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.