Araújo, J
Severo, M
Barros, H
Mishra, G D
Guimarães, J T
Ramos, E
Article History
Received: 30 April 2015
Revised: 22 June 2015
Accepted: 2 July 2015
First Online: 9 July 2015
Competing interests
: The authors declare no conflict of interest.