Manageiro, Vera
Graça, Rafael
Ferreira, Eugénia
Clemente, Lurdes
Bonnet, Richard
Caniça, Manuela
Article History
Received: 20 December 2016
Revised: 20 February 2017
Accepted: 28 February 2017
First Online: 5 April 2017
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.