Funding for this research was provided by:
Foundation for Research Support of the Federal District - Brazil (10569.56.30088.09042016)
Text and Data Mining valid from 2018-12-18
First Online: 18 December 2018
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interest.
: Informed consent was obtained from all individual participants included in the study. All procedures involving human participants were in accordance with the ethical standards of institutional and/or national research committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.