De Sousa, Ricardo Augusto Leoni
Article History
Received: 12 November 2017
Accepted: 19 February 2018
First Online: 7 March 2018
Compliance with ethical standards
: All procedures did not involve any human participants and/or animals, because it is a review article. This study is in accordance with the ethical standards of the national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.