Funding for this research was provided by:
Global Fund (20168770)
Article History
Received: 2 May 2019
Accepted: 18 February 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: This systematic review did not involve contact with any human participants, and therefore no ethical approval was needed. This study was conducted in compliance with the established ethical guidelines of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.