Cerezo Lajas, Alicia
Gutiérrez González, Enrique
Llorente Parrado, César
Puente Maestu, Luis
de Miguel-Díez, Javier
Article History
Received: 26 November 2017
Accepted: 31 January 2018
First Online: 14 February 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.