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. 2013 Aug;108(5):578–585. doi: 10.1590/0074-0276108052013007

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This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The municipality of Guaraí, state of Tocantins, Brazil.