Funding for this research was provided by:
European Research Council (768815)
Text and Data Mining valid from 2018-12-01
Received: 19 July 2018
Accepted: 18 October 2018
First Online: 3 December 2018
Ethics approval and consent to participate
: Studies performed in Bilomo and Kelleng received approval from the Cameroon National Ethics Committee and the University of Antwerp. Informed consent was obtained from all study participants.
: Written informed consent was obtained from all persons described in this paper.
: The authors declare that they have no competing interests.