Sánchez, Wilson Emilio David http://orcid.org/0000-0002-4842-3884
Avila, Suzana Moreira http://orcid.org/0000-0002-3181-685X
de Brito, José Luís Vital http://orcid.org/0000-0002-2278-9159
Article History
Received: 1 November 2017
Accepted: 20 May 2018
First Online: 7 June 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.