Funding for this research was provided by:
National Institute on Drug Abuse (R01DA045547)
Providence/Boston Center for AIDS Research (P30AI042853)
Received: 20 September 2019
Accepted: 4 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: The LINC-II study was approved by the Institutional Review Boards of Boston University Medical Campus (H-36706) and First St. Petersburg Pavlov State Medical University. All study participants complete the informed consent process including written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.