Funding for this research was provided by:
National Institute on Drug Abuse (T32DA019426)
U.S. Department of Health and Human Services (APH PA 006041)
Text and Data Mining valid from 2019-02-18
First Online: 18 February 2019
Compliance with Ethical Standards
: 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 Yale University School of Medicine 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.