Funding for this research was provided by:
Wellcome Trust (101815/Z/13/Z)
Text and Data Mining valid from 2019-07-18
Received: 7 May 2019
Accepted: 9 July 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: This paper is based solely on publicly available data from Demographic and Health Surveys and Reproductive Health Surveys. Ethical clearance was obtained by the institutions that conducted the surveys in each country.
: Not applicable
: The authors declare that they have no compating interests.