Funding for this research was provided by:
National Institute on Drug Abuse (R25DA031608, K01DA033879, R01DA024598, R01DA033862, R03DA039740)
National Institute of Allergy and Infectious Diseases (R21AI131979)
Article History
First Online: 15 October 2018
Compliance with Ethical Standards
: All study procedures and materials were reviewed and approved by the Institutional Review Boards at Boston University and the Pacific Institute for Research and Evaluation.