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. 2018 Dec 17;11:643. doi: 10.1186/s13071-018-3192-y

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© The Author(s). 2018

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 — Map of the area of study in the Philippines. The arrow in the smaller map of the Philippines indicates the location of Metro Manila and Laguna. The enlarged map of Metro Manila and Laguna shows the 12 cities and municipalities (labelled) from which the samples were obtained