Funding for this research was provided by:
National Institute on Drug Abuse (R01DA043408)
Received: 20 November 2019
Accepted: 2 July 2020
First Online: 9 July 2020
Ethics approval and consent to participate
: This study was approved by the research ethics board of Providence Health Care and the University of British Columbia. All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.