Funding for this research was provided by:
National Institute on Drug Abuse (R01DA018993, 3R01DA018993-05S1)
Article History
First Online: 5 January 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution 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 study participants.