Gutiérrez-Misis, A
Sánchez-Santos, M T
Banegas, J R
Castell, M V
González-Montalvo, J I
Otero, A
Article History
Received: 10 November 2014
Revised: 1 March 2015
Accepted: 4 March 2015
First Online: 16 April 2015
Competing interests
: The authors declare no conflict of interest.