Submitted for Publication: June 14, 2012; final revision received September 26, 2012; accepted November 9, 2012.
Published Online: June 26, 2013. doi:10.1001/jamapsychiatry.2013.1129.
Study concept and design: Tomasi, Volkow, Goldstein.
Acquisition of data: Tomasi.
Analysis and interpretation of data: Konova, Moeller, Tomasi, Goldstein.
Drafting of the manuscript: Konova, Moeller.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Konova, Moeller, Tomasi.
Obtained funding: Goldstein.
Administrative, technical, and material support: Tomasi, Volkow, Goldstein.
Study supervision: Tomasi, Volkow, Goldstein.
Conflict of Interest Disclosures: None reported.
Funding/Support: This research was conducted with grant support from the National Institute on Drug Abuse (1R01DA023579 to Dr Goldstein and 1F32DA030017-01 to Dr Moeller).
Additional Contributions: Nelly Alia-Klein, PhD; Daniel Carrero, MS; Tom Maloney, PhD; Muhammad A. Parvaz, PhD; Patricia A. Woicik, PhD; Gene-Jack Wang, MD; Frank Telang, MD; Barbara Hubbard, RN; and the entire Neuropsychoimaging and PET group provided assistance with participant recruitment and study procedures.