Funding for this research was provided by:
National Institute on Drug Abuse (R01 DA037012, K01DA046697, K24 DA039780)
Text and Data Mining valid from 2020-03-10
Received: 21 August 2019
Accepted: 27 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: Study procedures were approved by the Institutional Review Board of the University of California, San Francisco. All participants completed informed consent procedures.
: Not applicable.
: The authors declare that they have no competing interests.