Funding for this research was provided by:
National Institute on Drug Abuse (R01DA038965, R01DA027689)
National Science Foundation (Graduate Research Fellowship Program (AY 2013)
Text and Data Mining valid from 2018-04-03
First Online: 3 April 2018
Compliance with Ethical Standards
: The study protocol was reviewed and approved by Institutional Review Boards at the University of Southern California and RTI International.