Funding for this research was provided by:
National Institute on Drug Abuse (R03DA039745, R01DA038632, R01DA047063, R01DA047820)
Received: 3 April 2020
Accepted: 3 September 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: The study was approved by the committee of the Human Research Subject Protection at Yale University and the Institutional Research Board Committee of the Connecticut Veteran Healthcare System. All participants provided written consent.
: All authors declare that they have no conflict of interest.