Funding for this research was provided by:
National Institute on Drug Abuse (P30 AI094189, K24 DA037804, R01 DA037601-01, U01 DA036935)
Text and Data Mining valid from 2019-03-20
First Online: 20 March 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 Institutional Review Board at Johns Hopkins University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants in the study.