Montoto-Marqués, A
Ferreiro-Velasco, M E
Salvador-de la Barrera, S
Balboa-Barreiro, V
Rodriguez-Sotillo, A
Meijide-Failde, R
Article History
Received: 19 October 2016
Revised: 27 December 2016
Accepted: 9 January 2017
First Online: 14 February 2017
Competing interests
: The authors declare no conflict of interest.