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. 2017 Apr 4;16:139. doi: 10.1186/s12936-017-1771-6

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Study region map. Red points mark the villages surveyed. Antananarivo (black triangle) is the capital of Madagascar, from where the community surveyed in the Ampasimpotsy community of Tsiroanomandidy district were originally from