Gómez-Vega, Mafalda http://orcid.org/0000-0003-0810-3517
Herrero-Prieto, Luis César http://orcid.org/0000-0002-2915-5706
Article History
Received: 26 September 2017
Accepted: 30 October 2018
First Online: 15 November 2018
Compliance with ethical standard
:
: The authors declare that they have no conflict of interest.