Funding for this research was provided by:
National Institute on Drug Abuse (T32DA007292, R01DA022961)
Article History
First Online: 17 August 2018
Compliance with Ethical Standards
: The study was approved by the Johns Hopkins Bloomberg School of Public Health Institutional Review Board.
: The work is solely the responsibility of the authors and does not necessarily reflect the official views of the NIH. The funding source did not play a role in determining study design, data collection, analysis or interpretation, writing the report, or the decision to submit the report for publication.