Sierra, E.
Fernández, A.
Espinosa de los Monteros, A.
Díaz-Delgado, J.
Bernaldo de Quirós, Y.
García-Álvarez, N.
Arbelo, M.
Herráez, P.
Article History
Received: 22 April 2015
Accepted: 5 October 2015
First Online: 30 October 2015
Competing interests
: The authors declare no competing financial interests.