Alcalde Cuesta, Fernando http://orcid.org/0000-0002-6863-4283
González Sequeiros, Pablo http://orcid.org/0000-0001-9486-814X
Lozano Rojo, Álvaro http://orcid.org/0000-0002-1184-5901
Article History
Received: 17 February 2017
Accepted: 1 June 2017
First Online: 14 July 2017
Competing Interests
: The authors declare that they have no competing interests.