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. 2012 Dec 10;7(12):e51565. doi: 10.1371/journal.pone.0051565

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Map of the five sampling sites, Jotagua (A), Agua Caliente (B), Cofradia de Navolato (C), Iraguato (D), and El Castillo (E) that were selected to be 14–38 km apart and to represent the study area in the Culiacan Valley, Sinaloa, Mexico. Dark areas in the map indicate urban zones with more than 20,000 inhabitants. Scale bar corresponds to 50 km.