Esquirol, A
Pascual, M J
Ortiz, M
PiƱana, J L
Ferra, C
Garcia Cadenas, I
Vilades, I
Brunet, S
Martino, R
Sierra, J
Article History
Received: 17 October 2016
Revised: 12 April 2017
Accepted: 25 April 2017
First Online: 12 June 2017
Competing interests
: The authors declare no conflict of interest.