Funding for this research was provided by:
World Health Organization
Text and Data Mining valid from 2019-11-19
Received: 29 August 2019
Accepted: 18 October 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: Scientific and technical approval was obtained from the WHO Human Reproduction Programme (HRP) Review Panel on Research Projects (RP2) and ethics approval was received from the WHO Ethics Review Committee (protocol ID, 004571).
: Not applicable.
: The authors declare that they have no competing interests.