Pérez, T
Tijero, B
Gabilondo, I
Luna, A
Llorens, V
Berganzo, K
Acera, M
Gonzalez, A
Sanchez-Ferro, A
Lezcano, E
Zarranz, J J
Gómez-Esteban, J C
Article History
Received: 30 July 2014
Revised: 28 November 2014
Accepted: 5 December 2014
First Online: 29 January 2015
Competing interests
: The authors declare no conflict of interest.