Funding for this research was provided by:
National Institute on Drug Abuse (R01DA001411)
First Online: 1 August 2020
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interest.
: The study procedures were approved by the University of Michigan’s Health Sciences and Behavioral Sciences Institutional Review Board, and were performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Appropriate consent procedures were used in accordance with federal, state, and school policies.