Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2017YFE0103800)
National Institutes of Health (NIAID 1R01AI114310-01; 1UG3HD096929-01)
Center for AIDS Research, University of North Carolina at Chapel Hill (NIAID 5P30AI050410)
Doris Duke Charitable Foundation (International Clinical Research Fellowship)
National Institute of Allergy and Infectious Diseases (K24AI143471)
UNC-South China STD Research Training Center (FIC 1D43TW009532-01)
Received: 29 April 2019
Accepted: 29 July 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: Institutional Review Board (IRB) approval has been obtained from the following institutional ethical review boards prior to study enrollment: Southern Medical University Guangdong Provincial Center for Skin Diseases and STI Control (China), Yale University (USA), and University of North Carolina at Chapel Hill (USA). All participants will provide consent prior to taking part in the study (see Additional file InternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.