Funding for this research was provided by:
Wellcome Trust (202687/Z/16/Z)
Received: 5 June 2019
Accepted: 10 September 2019
First Online: 9 October 2019
Ethics approval and consent to participate
: The study was conducted under the ethical clearance N° 2016/11/832/CE/CNERSH/SP delivered by the Cameroon National Ethics (CNE) Committee for Research on Human Health Ref D30–172/L/MINSANTE/SG/DROS/TMC of 04 April 2017.
: Not applicable.
: The authors declare that they have no competing interests.