Marques, A. C.
Santos, L.
Costa, M. N.
Dantas, J. M.
Duarte, P.
Gonçalves, A.
Martins, R.
Salgueiro, C. A.
Fortunato, E.
Article History
Received: 22 January 2015
Accepted: 20 March 2015
First Online: 20 April 2015
Competing interests
: The authors declare no competing financial interests.