Urtasun, R
Elizalde, M
Azkona, M
Latasa, M U
García-Irigoyen, O
Uriarte, I
Fernández-Barrena, M G
Vicent, S
Alonso, M M
Muntané, J
Prieto, J
Ávila, M A
Berasain, C
Article History
Received: 8 June 2015
Revised: 19 November 2015
Accepted: 4 December 2015
First Online: 25 January 2016
Competing interests
: The authors declare no conflict of interest.