da Silva, A P
Matos, A
Ribeiro, R
Gil, Â
Valente, A
Bicho, M
Gorjão-Clara, J
Article History
Received: 5 February 2016
Revised: 29 July 2016
Accepted: 3 August 2016
First Online: 21 September 2016
Competing interests
: The authors declare no conflict of interest.