Funding for this research was provided by:
National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention (U01PS000677)
Received: 8 June 2019
Revised: 7 December 2019
Accepted: 13 December 2019
First Online: 3 March 2020
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.