Velasco-Guardado, A
Mora-Soler, A
López-Corral, L
López-Godino, O
Vázquez-López, L
Blanco-Muñez, O
Pérez-López, E
Rodríguez-Pérez, A
Caballero-Barrigón, D
Article History
Received: 30 April 2015
Revised: 21 January 2016
Accepted: 24 January 2016
First Online: 7 March 2016
Competing interests
: The authors declare no conflict of interest.