Scientific Research and Essays 1992-2248 Academic Journals 10.5897/SRE2015.6305 Barbara Fernanda Soares de Oliveira e Silva Roberta Veloso Garcia Paula Cristiane Pinto Mesquita Pardal Estaner Claro Romao * E-mail: estaner23@usp.br 2015 30 08 2015 03 08 2015 14 08 2015 10 16 522 530 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/SRE/article-abstract/A1A16BC54962 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/SRE/article-full-text-pdf/A1A16BC54962 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24