Received: 3 November 2017
Accepted: 26 February 2018
First Online: 6 March 2018
: ASO, RNP, OVL and DCBS received PhD scholarships from one of the following Brazilian agencies: FAPEAM, FAPESP, FIOCRUZ, CNPq and CAPES. DCBS is a PhD student from the Graduation Program in Tropical Medicine from the State University of Amazonas, Brazil. PFPP, FTMC, NFCS and MVGL are senior fellows supported by CNPq.
: Not applicable.
: The authors declare that they have no competing interests.
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