Sampaio Filho, Cesar I. N.
Moreira, André A.
Andrade, Roberto F. S.
Herrmann, Hans J.
Andrade, José S. Jr.
Article History
Received: 27 June 2014
Accepted: 19 December 2014
First Online: 13 March 2015
Competing interests
: The authors declare no competing financial interests.