Soares-Cunha, C
Coimbra, B
Borges, S
Carvalho, M M
Rodrigues, A J
Sousa, N http://orcid.org/0000-0002-8755-5126
Article History
Received: 6 February 2014
Revised: 11 April 2014
Accepted: 22 April 2014
First Online: 10 June 2014
Competing interests
: The authors declare no conflict of interest.