Bandín, C
Scheer, F A J L
Luque, A J
Ávila-Gandía, V
Zamora, S
Madrid, J A
Gómez-Abellán, P
Garaulet, M
Article History
Received: 23 July 2014
Revised: 25 September 2014
Accepted: 2 October 2014
First Online: 14 October 2014
Competing interests
: The authors declare no conflict of interest.