Funding for this research was provided by:
National Institutes of Health (R01DA035813)
Text and Data Mining valid from 2019-11-04
Received: 14 March 2019
Accepted: 11 September 2019
First Online: 4 November 2019
Compliance with ethical standards
: Participants were recruited from the local community through internet advertising, flyers, and referrals, and gave written informed consent for a protocol approved by the University of Maryland Baltimore Institutional Review Board.
: The authors declare that there is no conflict of interest.