Mateo-Gavira, I
Vílchez-López, F J
García-Palacios, M V
Carral-San Laureano, F
Visiedo-García, F M
Aguilar-Diosdado, M
Article History
Received: 2 February 2016
Revised: 20 June 2016
Accepted: 12 July 2016
First Online: 18 August 2016
Competing interests
: The authors declare no conflict of interest.