Funding for this research was provided by:
National Institute on Drug Abuse (R01DA026217, F31DA038409)
First Online: 7 April 2017
Compliance with Ethical Standards
: This project was funded by the National Institute on Drug Abuse through a grant (R01DA026217) awarded to the first author. The second author’s efforts are facilitated by the National Institute on Drug Abuse through a training grant (F31DA038409).
: The authors declare that they have no conflicts of interest.
: Pennsylvania State University’s IRB approved this study. 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.Informed consent was obtained from all individual participants included in the study.