Text and Data Mining valid from 2019-08-22
Received: 27 May 2019
Accepted: 12 August 2019
First Online: 22 August 2019
Ethics approval and consent to participate
: The research ethics committee of the University of Jaen (Spain) approved the study protocol at 24 April 2017.
: No personal data were recorded for any participant. The data were treated in an aggregate and anonymous manner.
: The authors declare that they have no competing interest.