Funding for this research was provided by:
DC Metro Tobacco Research and Instruction Consortium (AI117970)
Received: 30 July 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study was approved and overseen by the Chesapeake Institutional Review Board (IRB), now Advarra (Pro00022163). All participants provided written informed consent prior to study enrollment.
: Not applicable.
: One author has potential conflicts of interests to declare. Dr. Manya Magnus (GW) has received grants from the NIH for HIV Prevention Trials Network Clinical Research site and for the DC Center for AIDS, although she has received no funds directly. She is also the author of three epidemiology textbooks through Jones and Barlett Inc. from which she receives royalties.