Funding for this research was provided by:
Wellcome Trust (209305/Z/17/Z)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (BEX-6193)
Text and Data Mining valid from 2019-05-14
Received: 21 January 2019
Accepted: 6 May 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: No specific permits were required for the described field work as no human participants were involved. Oral consent was obtained from householders prior to collections and no personal details were recorded.
: Not applicable.
: The authors declare that they have no competing interests.