Durão, C
Oliveira, A
Santos, A C
Severo, M
Guerra, A
Barros, H
Lopes, C
Article History
Received: 28 June 2016
Revised: 10 November 2016
Accepted: 11 December 2016
First Online: 28 December 2016
Competing interests
: The authors declare no conflict of interest.