Funding for this research was provided by:
Belgisch Ontwikkelingsagentschap (NA)
Received: 23 November 2018
Accepted: 5 February 2019
First Online: 21 February 2019
Ethics approval and consent to participate
: N° 1212/18 of the Institute of Tropical Medicine, Antwerp, Belgium, Institutional Review Board.
: Not applicable.
: The authors declare that they have no competing interests.
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