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JDT, WT and HL contributed equally.
Contributors This commentary was conceived by JDT, WT and HL. JDT wrote the first draft. CL, RF and BC helped with figures and tables. TMT and ST organised the designathon. All authors contributed to the manuscript and approved the final version. All authors meet criteria for coauthorship.
Funding This work was supported by the National Institutes of Health (National Institute of Allergy and Infectious Diseases 1R01AI114310), UNC-South China STD Research Training Centre (Fogarty International Centre 1D43TW009532 to JDT), UNC Center for AIDS Research (National Institute of Allergy and Infectious Diseases 5P30AI050410) and the UNC Chapel Hill, Johns Hopkins University, Morehead School of Medicine and Tulane University (UJMT) Fogarty Fellowship (FIC R25TW0093). The listed grant funders played no role in any step of this study.
Competing interests None declared.
Ethics approval This article does not contain any studies with animals performed by any of the authors. 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. The study was approved by the Guangdong Provincial STD Control Center IRB and the UNC IRB.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement All unidentified data associated with this commentary are available upon request.
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