Universidade Federal do Rio de Janeiro, NUTES/UFRJ, Rio de Janeiro, Brazil
Universidade de S?o Paulo, Faculty of Public Health, S?o Paulo, Brazil;
Research Institute of the Collective Subject Discourse, S?o Paulo, Brazil
Copyright © 2014 Eliane Brígida Morais Falcão, Fernando Lefevre et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.