García-Ruiz, E
Reynés, B
Díaz-Rúa, R
Ceresi, E
Oliver, P
Palou, A
Article History
Received: 20 December 2014
Revised: 2 June 2015
Accepted: 7 June 2015
First Online: 11 June 2015
Competing interests
: The authors declare no conflict of interest.