Funding for this research was provided by:
United States Agency for International Development (AID-OAA-A-11-00048)
Wellcome Trust (201900/Z/16/Z)
Received: 26 January 2020
Accepted: 1 April 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: Ethical approval for this work was obtained from the Cameroon National ethics committee (CNEC) number 2015/09/640/CE/CNERSH/SP of 16th September 2015. The Administrative approval number D112-244NS/MINSANTE/SG/DLMEP/SDL/PMDTN/PNLO of 11th August 2016, was granted by the Ministry of Public Health of Cameroon. Individual informed written consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.