Liu, Weiwei
Mumford, Elizabeth A.
Funding for this research was provided by:
National Institute on Drug Abuse (1R01DA030496)
Article History
First Online: 27 March 2017
Compliance with Ethical Standards
:
: This research was funded by the National Institute on Drug Abuse (1R01DA030496).
: The authors declare that they have no conflict of interest.
: All procedures were in accordance with the ethical standards of the NORC IRB and 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this secondary data analysis study, formal consent is not required.