Funding for this research was provided by:
united states agency for international development (AID-OAA-A-14-00011, GPO-A-00-08-00005, AID-OAA-A-14-00005)
bill and melinda gates foundation (OPP41266)
national department of health
south african department of science and technology
Received: 29 June 2021
Accepted: 31 August 2021
First Online: 14 September 2021
Change Date: 23 September 2021
Change Type: Update
Change Details: Figures 1 and 2 were inappropriately placed under Methods section. The article has been updated to rectify the errors.
: The authors state that they have obtained appropriate institutional review board approval or have followed the principles outlined in the Declaration of Helsinki for all human investigations. Informed consent was obtained from the participants involved in the FACTS 001 study including those participants consenting the use of their returned, used gel applicators for the biomarker analysis.
: I certify that the work submitted for publication is original and not being considered elsewhere. All co-authors have knowledge of this work and agree to its submission.
: None of the authors have any relevant financial and/or nonfinancial relationships to disclose.