Zhao, Guanlan
Ronda, Elena
Cea, Lucía
Pulido, José
Barrio, Gregorio
Regidor, Enrique
Article History
Received: 29 March 2018
Accepted: 13 December 2018
First Online: 2 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study database did not include individual identifiers, so approval by the Ethics Committee was not required.