Funding for this research was provided by:
National Institute on Drug Abuse (1R01DA02441-07, 5R01DA003721-08, 5R01DA021426-11)
Robert Wood Johnson Foundation (RWJ21548)
First Online: 27 March 2017
Compliance with Ethical Standards
: This work was supported by grant nos. 1R01DA02441-07, 5R01DA003721-08, and 5R01DA021426-11 from the National Institute on Drug Abuse and RWJ21548 from the Robert Wood Johnson Foundation. The content of this paper is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies.
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. All activities associated with this study were approved by the UW Institutional Review Board.
: Informed consent was obtained for all participants in the study.