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. 2013 Dec 10;7:836. doi: 10.3389/fnhum.2013.00836

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Copyright © 2013 Mota-Rolim, Targino, Souza, Blanco, Araujo and Ribeiro.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Epidemiological characteristics of the population sample. Age distribution (left; white bars = male, black bars = female) and boxplot of ages within genders (right). Outliers indicated by crosses.