Rodriguez-Perales, S
Torres-Ruiz, R
Suela, J
Acquadro, F
Martin, M C
Yebra, E
Ramirez, J C
Alvarez, S
Cigudosa, J C
Article History
Received: 29 May 2014
Revised: 21 January 2015
Accepted: 2 February 2015
First Online: 23 March 2015
Competing interests
: The authors declare no conflict of interest.